Phosphor converted LEDs with omni-directional-reflector coating

doi:10.1364/OE.17.023530

Phosphor converted LEDs with omni-directional-reflector coating

Jim-Yong Chi, Ji-Siao Chen, Chuan-Yu Liu, Cheng-wen Chu, and Kuo-Hsien Chiang »View Author Affiliations

Optics Express, Vol. 17, Issue 26, pp. 23530-23535 (2009)
http://dx.doi.org/10.1364/OE.17.023530

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Abstract
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Abstract

A packaging scheme utilizing omni-directional reflective (ODR) optical coating is described to enhance the light extraction of near UV excited, phosphor-converted LEDs. A simple 1D model was developed to analyze the spectra of the extracted light measured with an integration-sphere as a function of phosphor layer concentration and thickness. Quantitative determination of the absorption coefficients at the pump and fluorescent light wavelength along with the conversion coefficient of phosphors were obtained. The reflection of the ODR film and the back reflector are also characterized. These parameters are then used for efficiency optimization of the present packaging scheme. A maximum enhancement of 40% can be expected with the materials and the configuration used in the present work.

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(230.5298) Optical devices : Photonic crystals

ToC Category:
Optical Devices

History
Original Manuscript: October 9, 2009
Revised Manuscript: November 16, 2009
Manuscript Accepted: November 18, 2009
Published: December 8, 2009

Citation
Jim-Yong Chi, Ji-Siao Chen, Chuan-Yu Liu, Cheng-wen Chu, and Kuo-Hsien Chiang, "Phosphor converted LEDs with omni-directional-reflector coating," Opt. Express 17, 23530-23535 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-26-23530

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References

Y. Narukawa, M. Sano, M. Ichikawa, S. Minato, T. Sakamoto, T. Yamada, and T. Mukai, “Improvement of Luminous Efficiency in White Light Emitting Diodes by Reducing a Forward-bias Voltage,” Jpn. J. Appl. Phys. 46, Part 2, 36–40 (2007). [CrossRef]
J. S. Kim, P. E. Jeon, J. C. Choi, H. L. Park, S. I. Mho, and G. C. Kim, “Warm-white-light emitting diode utilizing a single-phase full-color Ba3MgSi2O8:Eu2+, Mn2+ phosphor,” Appl. Phys. Lett. 84(15), 2931 (2004). [CrossRef]
C.-H. Kuo, J.-K. Sheu, S.-J. Chang, Y.-K. Su, L.-W. Wu, J.-M. Tsai, C. H. Liu, and R. K. Wu, “n-UV+Blue/Green /Red White Light Emitting Diode Lamps,” Jpn. J. Appl. Phys. 42,(Part 1,No. 4B), 2284–2287 (2003). [CrossRef]
J. K. Park, M. A. Lim, C. H. Kim, H. D. Park, J. T. Park, and S. Y. Choi, “White light-emitting diodes of GaN-based Sr2SiO4: Eu and the luminescent properties,” Appl. Phys. Lett. 82(5), 683 (2003). [CrossRef]
Y.-D. Huh, J.-H. Shim, Y. Kim, and Y. R. Do, “Optical properties of three-band white light emitting diodes,” J. Electrochem. Soc. 150(2), H57 (2003). [CrossRef]
M. H. Crawford, “LEDs for Solid-State Lighting: Performance Challenges and Recent Advances,” IEEE J Sel. Top. Quantum Electron. 15, 1026 (2009).
C. C. Chang, R. Chern, C. C. Chang, C. Chu, J. Y. Chi, J. Su, I. Chan, and J. T. Wang, “Monte Carlo Simulation of Optical Properties of Phosphor-Screened Ultraviolet Light in a White Light-Emitting Device,” Jpn. J. Appl. Phys. 44(8), 6056–6061 (2005). [CrossRef]
E.-Y. Kang, E. Wu, and D.-M. Wang, “Modeling white light-emitting diodes with phosphor layers,” Appl. Phys. Lett. 89(23), 231102 (2006). [CrossRef]

Chan, I.
Chang, C. C.
Chang, S.-J.
Chern, R.
Chi, J. Y.
Choi, J. C.
Choi, S. Y.
Chu, C.
Crawford, M. H.
Do, Y. R.
Huh, Y.-D.
Jeon, P. E.
Kang, E.-Y.
Kim, C. H.
Kim, G. C.
Kim, J. S.
Kim, Y.
Kuo, C.-H.
Lim, M. A.
Liu, C. H.
Mho, S. I.
Park, H. D.
Park, H. L.
Park, J. K.
Park, J. T.
Sheu, J.-K.
Shim, J.-H.
Su, J.
Su, Y.-K.
Tsai, J.-M.
Wang, D.-M.
Wang, J. T.
Wu, E.
Wu, L.-W.
Wu, R. K.

Appl. Phys. Lett.

J. S. Kim, P. E. Jeon, J. C. Choi, H. L. Park, S. I. Mho, and G. C. Kim, “Warm-white-light emitting diode utilizing a single-phase full-color Ba3MgSi2O8:Eu2+, Mn2+ phosphor,” Appl. Phys. Lett. 84(15), 2931 (2004). [CrossRef]
J. K. Park, M. A. Lim, C. H. Kim, H. D. Park, J. T. Park, and S. Y. Choi, “White light-emitting diodes of GaN-based Sr2SiO4: Eu and the luminescent properties,” Appl. Phys. Lett. 82(5), 683 (2003). [CrossRef]
E.-Y. Kang, E. Wu, and D.-M. Wang, “Modeling white light-emitting diodes with phosphor layers,” Appl. Phys. Lett. 89(23), 231102 (2006). [CrossRef]

IEEE J Sel. Top. Quantum Electron.

M. H. Crawford, “LEDs for Solid-State Lighting: Performance Challenges and Recent Advances,” IEEE J Sel. Top. Quantum Electron. 15, 1026 (2009).

J. Electrochem. Soc.

Y.-D. Huh, J.-H. Shim, Y. Kim, and Y. R. Do, “Optical properties of three-band white light emitting diodes,” J. Electrochem. Soc. 150(2), H57 (2003). [CrossRef]

Jpn. J. Appl. Phys.

C.-H. Kuo, J.-K. Sheu, S.-J. Chang, Y.-K. Su, L.-W. Wu, J.-M. Tsai, C. H. Liu, and R. K. Wu, “n-UV+Blue/Green /Red White Light Emitting Diode Lamps,” Jpn. J. Appl. Phys. 42,(Part 1,No. 4B), 2284–2287 (2003). [CrossRef]
C. C. Chang, R. Chern, C. C. Chang, C. Chu, J. Y. Chi, J. Su, I. Chan, and J. T. Wang, “Monte Carlo Simulation of Optical Properties of Phosphor-Screened Ultraviolet Light in a White Light-Emitting Device,” Jpn. J. Appl. Phys. 44(8), 6056–6061 (2005). [CrossRef]

Other

Y. Narukawa, M. Sano, M. Ichikawa, S. Minato, T. Sakamoto, T. Yamada, and T. Mukai, “Improvement of Luminous Efficiency in White Light Emitting Diodes by Reducing a Forward-bias Voltage,” Jpn. J. Appl. Phys. 46, Part 2, 36–40 (2007). [CrossRef]

2009, Crawford, IEEE J Sel. Top. Quantum Electron.
2006, Kang, Appl. Phys. Lett.
2005, Chang, Jpn. J. Appl. Phys.
2004, Kim, Appl. Phys. Lett.
2003, Kuo, Jpn. J. Appl. Phys.
2003, Park, Appl. Phys. Lett.
2003, Huh, J. Electrochem. Soc.

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