Engineer,Industrial Technology Research Institute (ITRI)
4000K CCT OLED lighting device
MEIJU LEE (1,2*) , YI HONG JIANG(1), ZHI MING LAI (1) , JUN KAI QIU(1) and YI PAI HUANG(2)
(1)Electronics and Optoelectronics System Research Laboratories, Industrial Technology Research Institute (ITRI), Hsinchu, Taiwan 310, Republic of China.
(2)Institute of EO engineering, National Chiao Tung University (NCTU), Hsinchu, Taiwan 310, Republic of China.
The Organic light-emitting devices (OLEDs) is one of the most promising candidates for the next generation display technologies since it exhibits advantages of low-power consumption, high brightness and low cost. Tandem OLED provide enhanced brightness yet without increasing driving current. Incorporating well-designed microcavity structure in OLEDs can provide up to a two-fold enhancement in luminance and efficiency [1, 2, 3]. In this work, we combined two luminance-enhancement technologies, microcavity and tandem. We studied different emitter materials and OLED architecture, ex: R/G/B/B, R/G/B, and RG/BB each stack or unit is coupled by a charge generation layer (CGL) which generates both hole and electron current. Finally we developed a microcavity 4000K CCT 4-tandem OLEDs with excellent performance. The correlated color temperature is 4000K, the color rendering index is 92, and the efficacy is closed 30 lm/W with driving 11.3 V at 1000 cd/m2. The color coordination of CIE-1931 (x, y) is (0.38, 0.38) .
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