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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 3 — Jan. 30, 2012
  • pp: 3005–3014

Improve efficiency of white organic light-emitting diodes by using nanosphere arrays in color conversion layers

Yu-Hsuan Ho, Ding-Wei Huang, Yung-Ting Chang, Ya-Han Ye, Chih-Wei Chu, Wei-Cheng Tian, Chin-Ti Chen, and Pei-Kuen Wei  »View Author Affiliations


Optics Express, Vol. 20, Issue 3, pp. 3005-3014 (2012)
http://dx.doi.org/10.1364/OE.20.003005


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Abstract

The authors demonstrated an efficient color conversion layer (CCL) by using nanosphere arrays in down-converted white organic light-emitting diodes (WOLEDs). The introduced periodical nanospheres not only helped extract the confined light in devices, but also increased the effective light path to achieve high-efficiency color conversion. By applying a CCL with red phosphor on a 400-nm-period nanosphere array, we achieved 137% color conversion ratio for blue OLEDs, which was 2.68 times higher than conventional flat CCL. The resulting luminous efficiency of WOLEDs with patterned CCLs (20.97 cd/A, 1000 cd/m2) was two times higher than the efficiency of the flat device (10.26 cd/A, 1000 cd/m2).

© 2012 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:
Optical Devices

History
Original Manuscript: November 21, 2011
Revised Manuscript: January 13, 2012
Manuscript Accepted: January 13, 2012
Published: January 25, 2012

Citation
Yu-Hsuan Ho, Ding-Wei Huang, Yung-Ting Chang, Ya-Han Ye, Chih-Wei Chu, Wei-Cheng Tian, Chin-Ti Chen, and Pei-Kuen Wei, "Improve efficiency of white organic light-emitting diodes by using nanosphere arrays in color conversion layers," Opt. Express 20, 3005-3014 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-3-3005


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