| Summary: | 碩士 === 義守大學 === 電子工程學系 === 101 === In this paper, we dope blue phosphorescent iridium complexes in the small molecular
phosphorescent host N, N_-dicarbazolyl-3, 5-benzene (mCP) to produce high efficient blue phosphorescent organic light-emitting diodes (PHOLEDs). By combining the PHOLED with a organic color conversion layer (CCL) formed of 4-(Dicyanomethylene)-2-tert-butyl-6-(1,1,7,7-tetramethyljulolidin-4-yl-vinyl)-4H-pyran (DCJTB) to fabricate white organic light-emitting diodes (WOLEDs). Optimizing the parameters of CCLs, a pure white light emission with CIE coordinates of (0.34, 0.34) is obtained.
The peak of PHOLED electroluminescent (EL) spectrum locates at 472 nm, which is used as the excitation source of the CCL. Organic dyes of DCJTB, EY51, ER53, and EG51 are used as the materials to fabricate the CCL. Experimental results show that the CCL formed of DCJTB can absorb blue light efficiently to convert red emission, and then the red emission mixes with some of unabsorbed blue emission of PHOLED to produce white light emission.
When the CCL is formed by spin-coating the red dye on the glass substrate and combine with a PHOLED, the maximum current efficiency of 3.88 cd/A and luminance of 2470 cd/m2 have been achieved and a white light emission with CIE coordinates of (0.33, 0.37) is obtained. CIE variation is limited within (±0.03, ±0.03).
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