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Highly circularly polarized white light using a combination of white polymer light-emitting diode and wideband cholesteric liquid crystal reflectorHyun-Jung Lee, Bo Ram Lee, Suk-Won Choi, and Myoung Hoon Song »View Author Affiliations
Hyun-Jung Lee,1
Bo Ram Lee,1
Suk-Won Choi,2,3
and Myoung Hoon Song1,*
1School of Mechanical and Advanced Materials Engineering/Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan, 689-805, South Korea 2Department of Advanced Materials Engineering for Information and Electronics, Kyung Hee University, Yongin, Gyeonggi-do 446-701, South Korea 3schoi@khu.ac.kr *Corresponding author: mhsong@unist.ac.kr |
Optics Express, Vol. 20, Issue 22, pp. 24472-24481 (2012)
http://dx.doi.org/10.1364/OE.20.024472
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Abstract
We present a simple and intriguing device that generates highly circularly polarized white light. It comprises white polymer light-emitting diodes (WPLEDs) attached to a wideband cholesteric liquid crystal (CLC) reflector with a wide photonic bandgap (PBG) covering the visible range. The degree of circular polarization realized is very high over the visible range. The wide PBG was realized by introducing a gradient in pitch of the cholesteric helix by controlling the twisting power within the CLC medium. WPLEDs fabricated using a ternary (red, green, and blue) fluorescent polymer blend with the same moiety showed a low turn-on voltage, high brightness, high efficiency, and good color stability.
© 2012 OSA
OCIS Codes
(230.0230) Optical devices : Optical devices
(230.2090) Optical devices : Electro-optical devices
ToC Category:
Optical Devices
History
Original Manuscript: August 6, 2012
Revised Manuscript: October 3, 2012
Manuscript Accepted: October 5, 2012
Published: October 11, 2012
Citation
Hyun-Jung Lee, Bo Ram Lee, Suk-Won Choi, and Myoung Hoon Song, "Highly circularly polarized white light using a combination of white polymer light-emitting diode and wideband cholesteric liquid crystal reflector," Opt. Express 20, 24472-24481 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-22-24472
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References
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- M. Geoghegan, H. Ermer, G. Jüngst, G. Krausch, and R. Brenn, “Wetting in a phase separating polymer blend film: quench depth dependence,” Phys. Rev. E Stat. Phys. Plasmas Fluids Relat. Interdiscip. Topics62(11 Pt B), 940–950 (2000). [CrossRef] [PubMed]
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- Y.-Z. Lee, X. Chen, M.-C. Chen, S.-A. Chen, J.-H. Hsu, and W. Fann, “White-light electroluminescence from soluble oxadiazole-containing phenylene vinylene ether-linkage copolymer,” Appl. Phys. Lett.79(3), 308–310 (2001). [CrossRef]
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- M. Lee, H. Jang, S.-W. Choi, and K. Song, “Direct observation of pitch gradient in cholesteric liquid crystal film using fourier transform infrared spectroscopic imaging,” Bull. Korean Chem. Soc.30(7), 1625–1627 (2009). [CrossRef]
- E. Peeters, M. P. T. Christiaans, R. A. J. Janssen, H. F. M. Schoo, H. P. J. M. Dekkers, and E. W. Meijer, “Circularly polarized electroluminescence from a polymer light-emitting diode,” J. Am. Chem. Soc.119(41), 9909–9910 (1997). [CrossRef]
- M. G. Chee, M. H. Song, D. Kim, H. Takezoe, and I. J. Chung, “Lowring lasing threshold in chiral nematic liquid crystal structure with different anisotropies,” Jpn. J. Appl. Phys.46(18), L437–L439 (2007). [CrossRef]
- M. H. Song, B. Park, S. Nishimura, T. Toyooka, I. J. Chung, Y. Takanishi, K. Ishikawa, and H. Takezoe, “Electrotunable non-reciprocal laser emission from a liquid-crystal photonic device,” Adv. Funct. Mater.16(14), 1793–1798 (2006). [CrossRef]
- B. W. D'Andrade and S. R. Forrest, “White organic light-emitting devices for solid-state lighting,” Adv. Mater. (Deerfield Beach Fla.)16(18), 1585–1595 (2004). [CrossRef]
- S. J. Bai, C. C. Wu, T. D. Dang, F. E. Arnold, and B. Sakaran, “Tunable and white light-emitting diodes of monolayer fluorinated benzoxazole graft copolymers,” Appl. Phys. Lett.84(10), 1656–1658 (2004). [CrossRef]
- E. Peeters, M. P. T. Christiaans, R. A. J. Janssen, H. F. M. Schoo, H. P. J. M. Dekkers, and E. W. Meijer, “Circularly polarized electroluminescence from a polymer light-emitting diode,” J. Am. Chem. Soc.119(41), 9909–9910 (1997). [CrossRef]
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- M. Geoghegan, H. Ermer, G. Jüngst, G. Krausch, and R. Brenn, “Wetting in a phase separating polymer blend film: quench depth dependence,” Phys. Rev. E Stat. Phys. Plasmas Fluids Relat. Interdiscip. Topics62(11 Pt B), 940–950 (2000). [CrossRef] [PubMed]
- Y.-Z. Lee, X. Chen, M.-C. Chen, S.-A. Chen, J.-H. Hsu, and W. Fann, “White-light electroluminescence from soluble oxadiazole-containing phenylene vinylene ether-linkage copolymer,” Appl. Phys. Lett.79(3), 308–310 (2001). [CrossRef]
- B. W. D'Andrade and S. R. Forrest, “White organic light-emitting devices for solid-state lighting,” Adv. Mater. (Deerfield Beach Fla.)16(18), 1585–1595 (2004). [CrossRef]
- M. A. Baldo, S. Lamansky, P. E. Burrows, M. E. Thompson, and S. R. Forrest, “Very high-efficiency green organic light-emitting devices based on electrophosphorescence,” Appl. Phys. Lett.75(1), 4–6 (1999). [CrossRef]
- S. V. Belayev, M. Schadt, M. I. Barnik, J. Funfschilling, N. V. Malimoneko, and K. Schmitt, “Large aperture polarized light source and novel liquid crystal display operating modes,” Jpn. J. Appl. Phys.29(Part 2, No. 4), L634–L637 (1990). [CrossRef]
- J. P. Yang, Y. D. Jin, P. L. Heremans, R. Hoefnagels, P. Dieltiens, F. Blockhuys, H. J. Geise, M. Van der Auweraer, and G. Borghs, “White light emission from a single layer organic light emitting diode fabricated by spincoating,” Chem. Phys. Lett.325(1-3), 251–256 (2000). [CrossRef]
- G. L. Tu, C. Y. Mei, Q. G. Zhou, Y. X. Cheng, Y. H. Geng, L. X. Wang, D. G. Ma, X. B. Jing, and F. S. Wang, “Highly efficient pure-white-light-emitting diodes from a single polymer: polyfluorene with naphthalimide moieties,” Adv. Funct. Mater.16(1), 101–106 (2006). [CrossRef]
- M. Geoghegan, H. Ermer, G. Jüngst, G. Krausch, and R. Brenn, “Wetting in a phase separating polymer blend film: quench depth dependence,” Phys. Rev. E Stat. Phys. Plasmas Fluids Relat. Interdiscip. Topics62(11 Pt B), 940–950 (2000). [CrossRef] [PubMed]
- X. Gong, S. Wang, D. Moses, G. C. Bazan, and A. J. Heeger, “Multilayer polymer light-emitting diodes: white-light emission with high efficiency,” Adv. Mater. (Deerfield Beach Fla.)17(17), 2053–2058 (2005). [CrossRef]
- X. Gong, W. Ma, J. C. Ostrowski, G. C. Bazan, D. Moses, and A. J. Heeger, “White electrophosphorescence from semiconducting polymer blends,” Adv. Mater. (Deerfield Beach Fla.)16(7), 615–619 (2004). [CrossRef]
- M. Grell, M. Oda, K. S. Whitehead, A. Asimakis, D. Neher, and D. D. C. Bradley, “A compact device for the efficient, electrically driven generation of highly circularly polarized light,” Adv. Mater. (Deerfield Beach Fla.)13(8), 577–580 (2001). [CrossRef]
- N. Y. Ha, Y. Ohtsuka, S. M. Jeong, S. Nishimura, G. Suzaki, Y. Takanishi, K. Ishikawa, and H. Takezoe, “Electro-tunable optical diode based on photonic bandgap liquid-crystal heterojunctions,” Nat. Mater.4, 383–387 (2008). [CrossRef] [PubMed]
- S. M. Jeong, Y. Ohtsuka, N. Y. Ha, Y. Takanishi, K. Ishikawa, H. Takezoe, S. Nishimura, and G. Suzaki, “Highly circularly polarized electroluminescence from organic light-emitting diodes with wide-band reflective polymeric cholesteric liquid crystal films,” Appl. Phys. Lett.90(21), 211106 (2007). [CrossRef]
- M. H. Song, N. Y. Ha, K. Amemiya, B. Park, Y. Takanishi, K. Ishikawa, J. W. Wu, S. Nishimura, T. Toyooka, and H. Takezoe, “Defect mode lasing with lowered threshold in a three-layered hetero cholesteric liquid crystal structure,” Adv. Mater. (Deerfield Beach Fla.)18(2), 193–197 (2006). [CrossRef]
- X. Gong, S. Wang, D. Moses, G. C. Bazan, and A. J. Heeger, “Multilayer polymer light-emitting diodes: white-light emission with high efficiency,” Adv. Mater. (Deerfield Beach Fla.)17(17), 2053–2058 (2005). [CrossRef]
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- areJ.-C. Kuhlmann, P. Bruyn, R. K. M. Bouwer, A. Meetsma, P. W. M. Blom, and J. C. Hummelen, “Improving the compatibility of fullerene acceptors with fluorene-containing donor-polymers in organic photovoltaic devices,” Chem. Commun. (Camb.)46(38), 7232–7234 (2010). [CrossRef] [PubMed]
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- M. Lee, H. Jang, S.-W. Choi, and K. Song, “Fabrication of broadband cholesteric liquid crystal films by photopolymerization-induced phase separation,” Mol. Cryst. Liq. Cryst. (Phila. Pa.)530(1), 169–174 (2010). [CrossRef]
- M. Lee, H. Jang, S.-W. Choi, and K. Song, “Direct observation of pitch gradient in cholesteric liquid crystal film using fourier transform infrared spectroscopic imaging,” Bull. Korean Chem. Soc.30(7), 1625–1627 (2009). [CrossRef]
- T. H. Kim, H. K. Lee, O. O. Park, B. D. Chin, S. H. Lee, and K. Kim, “White-light-emitting diodes based on iridium complexes via efficient energy transfer from a conjugated polymer,” Adv. Funct. Mater.16(5), 611–617 (2006). [CrossRef]
- Y.-Z. Lee, X. Chen, M.-C. Chen, S.-A. Chen, J.-H. Hsu, and W. Fann, “White-light electroluminescence from soluble oxadiazole-containing phenylene vinylene ether-linkage copolymer,” Appl. Phys. Lett.79(3), 308–310 (2001). [CrossRef]
- A. Liedtke, M. O’Neill, A. Wertmöller, S. P. Kitney, and S. M. Kelly, “White-light OLEDs using liquid crystal polymer networks,” Chem. Mater.20(11), 3579–3586 (2008). [CrossRef]
- M. Oda, H. G. Nothofer, G. Lieser, U. Scherf, S. C. J. Meskers, and D. Neher, “Circularly polarized electroluminescence from liquid-crystalline chiral polyfluorenes,” Adv. Mater. (Deerfield Beach Fla.)12(5), 362–365 (2000). [CrossRef]
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- X. Gong, W. Ma, J. C. Ostrowski, G. C. Bazan, D. Moses, and A. J. Heeger, “White electrophosphorescence from semiconducting polymer blends,” Adv. Mater. (Deerfield Beach Fla.)16(7), 615–619 (2004). [CrossRef]
- S. V. Belayev, M. Schadt, M. I. Barnik, J. Funfschilling, N. V. Malimoneko, and K. Schmitt, “Large aperture polarized light source and novel liquid crystal display operating modes,” Jpn. J. Appl. Phys.29(Part 2, No. 4), L634–L637 (1990). [CrossRef]
- areJ.-C. Kuhlmann, P. Bruyn, R. K. M. Bouwer, A. Meetsma, P. W. M. Blom, and J. C. Hummelen, “Improving the compatibility of fullerene acceptors with fluorene-containing donor-polymers in organic photovoltaic devices,” Chem. Commun. (Camb.)46(38), 7232–7234 (2010). [CrossRef] [PubMed]
- G. L. Tu, C. Y. Mei, Q. G. Zhou, Y. X. Cheng, Y. H. Geng, L. X. Wang, D. G. Ma, X. B. Jing, and F. S. Wang, “Highly efficient pure-white-light-emitting diodes from a single polymer: polyfluorene with naphthalimide moieties,” Adv. Funct. Mater.16(1), 101–106 (2006). [CrossRef]
- E. Peeters, M. P. T. Christiaans, R. A. J. Janssen, H. F. M. Schoo, H. P. J. M. Dekkers, and E. W. Meijer, “Circularly polarized electroluminescence from a polymer light-emitting diode,” J. Am. Chem. Soc.119(41), 9909–9910 (1997). [CrossRef]
- M. Oda, H. G. Nothofer, G. Lieser, U. Scherf, S. C. J. Meskers, and D. Neher, “Circularly polarized electroluminescence from liquid-crystalline chiral polyfluorenes,” Adv. Mater. (Deerfield Beach Fla.)12(5), 362–365 (2000). [CrossRef]
- M. Belalia, M. Mitov, C. Bourgerette, A. Krallafa, M. Belhakem, and D. Bormann, “Cholesteric liquid crystals with a helical pitch gradient: spatial distribution of the concentration of chiral groups by raman mapping in relation with the optical response and the microstructure,” Phys. Rev. E Stat. Nonlin. Soft Matter Phys.74(5), 051704 (2006). [CrossRef] [PubMed]
- X. Gong, S. Wang, D. Moses, G. C. Bazan, and A. J. Heeger, “Multilayer polymer light-emitting diodes: white-light emission with high efficiency,” Adv. Mater. (Deerfield Beach Fla.)17(17), 2053–2058 (2005). [CrossRef]
- X. Gong, W. Ma, J. C. Ostrowski, G. C. Bazan, D. Moses, and A. J. Heeger, “White electrophosphorescence from semiconducting polymer blends,” Adv. Mater. (Deerfield Beach Fla.)16(7), 615–619 (2004). [CrossRef]
- J. Kido, H. Shionoya, and K. Nagai, “White light‐emitting organic electroluminescent devices based on dye‐dispersed poly(N‐vinylcarbazole),” Appl. Phys. Lett.67(16), 2281–2283 (1995). [CrossRef]
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- M. Oda, H. G. Nothofer, G. Lieser, U. Scherf, S. C. J. Meskers, and D. Neher, “Circularly polarized electroluminescence from liquid-crystalline chiral polyfluorenes,” Adv. Mater. (Deerfield Beach Fla.)12(5), 362–365 (2000). [CrossRef]
- N. Y. Ha, Y. Ohtsuka, S. M. Jeong, S. Nishimura, G. Suzaki, Y. Takanishi, K. Ishikawa, and H. Takezoe, “Electro-tunable optical diode based on photonic bandgap liquid-crystal heterojunctions,” Nat. Mater.4, 383–387 (2008). [CrossRef] [PubMed]
- S. M. Jeong, Y. Ohtsuka, N. Y. Ha, Y. Takanishi, K. Ishikawa, H. Takezoe, S. Nishimura, and G. Suzaki, “Highly circularly polarized electroluminescence from organic light-emitting diodes with wide-band reflective polymeric cholesteric liquid crystal films,” Appl. Phys. Lett.90(21), 211106 (2007). [CrossRef]
- M. H. Song, B. Park, S. Nishimura, T. Toyooka, I. J. Chung, Y. Takanishi, K. Ishikawa, and H. Takezoe, “Electrotunable non-reciprocal laser emission from a liquid-crystal photonic device,” Adv. Funct. Mater.16(14), 1793–1798 (2006). [CrossRef]
- M. H. Song, N. Y. Ha, K. Amemiya, B. Park, Y. Takanishi, K. Ishikawa, J. W. Wu, S. Nishimura, T. Toyooka, and H. Takezoe, “Defect mode lasing with lowered threshold in a three-layered hetero cholesteric liquid crystal structure,” Adv. Mater. (Deerfield Beach Fla.)18(2), 193–197 (2006). [CrossRef]
- M. Oda, H. G. Nothofer, G. Lieser, U. Scherf, S. C. J. Meskers, and D. Neher, “Circularly polarized electroluminescence from liquid-crystalline chiral polyfluorenes,” Adv. Mater. (Deerfield Beach Fla.)12(5), 362–365 (2000). [CrossRef]
- A. Liedtke, M. O’Neill, A. Wertmöller, S. P. Kitney, and S. M. Kelly, “White-light OLEDs using liquid crystal polymer networks,” Chem. Mater.20(11), 3579–3586 (2008). [CrossRef]
- M. Grell, M. Oda, K. S. Whitehead, A. Asimakis, D. Neher, and D. D. C. Bradley, “A compact device for the efficient, electrically driven generation of highly circularly polarized light,” Adv. Mater. (Deerfield Beach Fla.)13(8), 577–580 (2001). [CrossRef]
- M. Oda, H. G. Nothofer, G. Lieser, U. Scherf, S. C. J. Meskers, and D. Neher, “Circularly polarized electroluminescence from liquid-crystalline chiral polyfluorenes,” Adv. Mater. (Deerfield Beach Fla.)12(5), 362–365 (2000). [CrossRef]
- N. Y. Ha, Y. Ohtsuka, S. M. Jeong, S. Nishimura, G. Suzaki, Y. Takanishi, K. Ishikawa, and H. Takezoe, “Electro-tunable optical diode based on photonic bandgap liquid-crystal heterojunctions,” Nat. Mater.4, 383–387 (2008). [CrossRef] [PubMed]
- S. M. Jeong, Y. Ohtsuka, N. Y. Ha, Y. Takanishi, K. Ishikawa, H. Takezoe, S. Nishimura, and G. Suzaki, “Highly circularly polarized electroluminescence from organic light-emitting diodes with wide-band reflective polymeric cholesteric liquid crystal films,” Appl. Phys. Lett.90(21), 211106 (2007). [CrossRef]
- J. Kido, K. Hongawa, K. Okuyama, and K. Nagai, “White light‐emitting organic electroluminescent devices using the poly(N‐vinylcarbazole) emitter layer doped with three fluorescent deyes,” Appl. Phys. Lett.64(7), 815–817 (1994). [CrossRef]
- X. Gong, W. Ma, J. C. Ostrowski, G. C. Bazan, D. Moses, and A. J. Heeger, “White electrophosphorescence from semiconducting polymer blends,” Adv. Mater. (Deerfield Beach Fla.)16(7), 615–619 (2004). [CrossRef]
- M. H. Song, B. Park, S. Nishimura, T. Toyooka, I. J. Chung, Y. Takanishi, K. Ishikawa, and H. Takezoe, “Electrotunable non-reciprocal laser emission from a liquid-crystal photonic device,” Adv. Funct. Mater.16(14), 1793–1798 (2006). [CrossRef]
- M. H. Song, N. Y. Ha, K. Amemiya, B. Park, Y. Takanishi, K. Ishikawa, J. W. Wu, S. Nishimura, T. Toyooka, and H. Takezoe, “Defect mode lasing with lowered threshold in a three-layered hetero cholesteric liquid crystal structure,” Adv. Mater. (Deerfield Beach Fla.)18(2), 193–197 (2006). [CrossRef]
- T. H. Kim, H. K. Lee, O. O. Park, B. D. Chin, S. H. Lee, and K. Kim, “White-light-emitting diodes based on iridium complexes via efficient energy transfer from a conjugated polymer,” Adv. Funct. Mater.16(5), 611–617 (2006). [CrossRef]
- S. Kim, J. Seo, H. K. Jung, J. J. Kim, and S. Y. Park, “White luminescence from polymer thin films containing excited-state intramolecular proton-transfer dyes,” Adv. Mater. (Deerfield Beach Fla.)17(17), 2077–2082 (2005). [CrossRef]
- E. Peeters, M. P. T. Christiaans, R. A. J. Janssen, H. F. M. Schoo, H. P. J. M. Dekkers, and E. W. Meijer, “Circularly polarized electroluminescence from a polymer light-emitting diode,” J. Am. Chem. Soc.119(41), 9909–9910 (1997). [CrossRef]
- L. M. Popescu, P. van 't Hof, A. B. Sieval, H. T. Jonkman, and J. C. Hummelen, “Thienyl analog of 1-(3-methoxycarbonyl)Propyl-1-Phenyl-[6,6]-methanofullerene for bulk heterojunction photovoltaic devices in combination with polythiophenes,” Appl. Phys. Lett.89(21), 213507 (2006). [CrossRef]
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- M. Oda, H. G. Nothofer, G. Lieser, U. Scherf, S. C. J. Meskers, and D. Neher, “Circularly polarized electroluminescence from liquid-crystalline chiral polyfluorenes,” Adv. Mater. (Deerfield Beach Fla.)12(5), 362–365 (2000). [CrossRef]
- S. V. Belayev, M. Schadt, M. I. Barnik, J. Funfschilling, N. V. Malimoneko, and K. Schmitt, “Large aperture polarized light source and novel liquid crystal display operating modes,” Jpn. J. Appl. Phys.29(Part 2, No. 4), L634–L637 (1990). [CrossRef]
- E. Peeters, M. P. T. Christiaans, R. A. J. Janssen, H. F. M. Schoo, H. P. J. M. Dekkers, and E. W. Meijer, “Circularly polarized electroluminescence from a polymer light-emitting diode,” J. Am. Chem. Soc.119(41), 9909–9910 (1997). [CrossRef]
- S. Kim, J. Seo, H. K. Jung, J. J. Kim, and S. Y. Park, “White luminescence from polymer thin films containing excited-state intramolecular proton-transfer dyes,” Adv. Mater. (Deerfield Beach Fla.)17(17), 2077–2082 (2005). [CrossRef]
- J. Kido, H. Shionoya, and K. Nagai, “White light‐emitting organic electroluminescent devices based on dye‐dispersed poly(N‐vinylcarbazole),” Appl. Phys. Lett.67(16), 2281–2283 (1995). [CrossRef]
- J. H. Kim, P. Herguth, M.-S. Kang, A. K. Y. Jen, Y.-H. Tseng, and C.-F. Shu, “Bright white light electroluminescent devices based on a dye-dispersed polyfluorene derivative,” Appl. Phys. Lett.85(7), 1116–1118 (2004). [CrossRef]
- L. M. Popescu, P. van 't Hof, A. B. Sieval, H. T. Jonkman, and J. C. Hummelen, “Thienyl analog of 1-(3-methoxycarbonyl)Propyl-1-Phenyl-[6,6]-methanofullerene for bulk heterojunction photovoltaic devices in combination with polythiophenes,” Appl. Phys. Lett.89(21), 213507 (2006). [CrossRef]
- M. Lee, H. Jang, S.-W. Choi, and K. Song, “Fabrication of broadband cholesteric liquid crystal films by photopolymerization-induced phase separation,” Mol. Cryst. Liq. Cryst. (Phila. Pa.)530(1), 169–174 (2010). [CrossRef]
- M. Lee, H. Jang, S.-W. Choi, and K. Song, “Direct observation of pitch gradient in cholesteric liquid crystal film using fourier transform infrared spectroscopic imaging,” Bull. Korean Chem. Soc.30(7), 1625–1627 (2009). [CrossRef]
- M. G. Chee, M. H. Song, D. Kim, H. Takezoe, and I. J. Chung, “Lowring lasing threshold in chiral nematic liquid crystal structure with different anisotropies,” Jpn. J. Appl. Phys.46(18), L437–L439 (2007). [CrossRef]
- M. H. Song, N. Y. Ha, K. Amemiya, B. Park, Y. Takanishi, K. Ishikawa, J. W. Wu, S. Nishimura, T. Toyooka, and H. Takezoe, “Defect mode lasing with lowered threshold in a three-layered hetero cholesteric liquid crystal structure,” Adv. Mater. (Deerfield Beach Fla.)18(2), 193–197 (2006). [CrossRef]
- M. H. Song, B. Park, S. Nishimura, T. Toyooka, I. J. Chung, Y. Takanishi, K. Ishikawa, and H. Takezoe, “Electrotunable non-reciprocal laser emission from a liquid-crystal photonic device,” Adv. Funct. Mater.16(14), 1793–1798 (2006). [CrossRef]
- N. Y. Ha, Y. Ohtsuka, S. M. Jeong, S. Nishimura, G. Suzaki, Y. Takanishi, K. Ishikawa, and H. Takezoe, “Electro-tunable optical diode based on photonic bandgap liquid-crystal heterojunctions,” Nat. Mater.4, 383–387 (2008). [CrossRef] [PubMed]
- S. M. Jeong, Y. Ohtsuka, N. Y. Ha, Y. Takanishi, K. Ishikawa, H. Takezoe, S. Nishimura, and G. Suzaki, “Highly circularly polarized electroluminescence from organic light-emitting diodes with wide-band reflective polymeric cholesteric liquid crystal films,” Appl. Phys. Lett.90(21), 211106 (2007). [CrossRef]
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- S. M. Jeong, Y. Ohtsuka, N. Y. Ha, Y. Takanishi, K. Ishikawa, H. Takezoe, S. Nishimura, and G. Suzaki, “Highly circularly polarized electroluminescence from organic light-emitting diodes with wide-band reflective polymeric cholesteric liquid crystal films,” Appl. Phys. Lett.90(21), 211106 (2007). [CrossRef]
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Adv. Funct. Mater.
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Adv. Mater. (Deerfield Beach Fla.)
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Bull. Korean Chem. Soc.
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Chem. Commun. (Camb.)
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Chem. Phys. Lett.
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Nat. Mater.
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- X. Gong, W. Ma, J. C. Ostrowski, G. C. Bazan, D. Moses, and A. J. Heeger, “White electrophosphorescence from semiconducting polymer blends,” Adv. Mater. (Deerfield Beach Fla.)16(7), 615–619 (2004). [CrossRef]
- B. W. D'Andrade and S. R. Forrest, “White organic light-emitting devices for solid-state lighting,” Adv. Mater. (Deerfield Beach Fla.)16(18), 1585–1595 (2004). [CrossRef]
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