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Organic wavelength‐converting‐film‐based hybrid planar white light‐emitting diodes
Authors:Sung Wook Kim  Hyoung Sun Yoo  Byoung‐Hwa Kwon  Dong Seok Kang  Minwon Suh  Duk Young Jeon
Affiliation:Korea Advanced Institute of Science and Technology, Department of Materials Science and Engineering, 335 Gwahangno, Deajeon, Yuseong‐gu 305‐701, Korea
Abstract:Abstract— In this study, organic wavelength‐converting films (WCFs) applied to InGaN blue LED‐based hybrid planar WLED has been fabricated. The organic dye layer in the WCF was formed between the upper and bottom polymer sheets by using a simple roll‐laminating technique. Subsequently, the hybrid planar WLEDs have been fabricated based upon these films. The luminous efficiency of green WCF‐based hybrid planar WLEDs with a single blue LED chip was 34.6 lm/W and that of red‐WCF‐assisted green WCF‐based hybrid planar WLEDs was 27.3 lm/W under 20 mA. The use of WCF to fabricate hybrid planar WLEDs showed better stability than that of directly coating organic color‐convergence materials (CCMs) on the LED chips. It only decreased to about 10% of the initial wavelength‐converting intensity after 1 hour of continual operation at 20 mA.
Keywords:Hybrid planar WLEDs  wavelength‐converting film  roll laminating process
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