Date
Place
- Room H (Room Hall 1, 1F)
- P2. Poster Session II
- August 21, 2015 (Friday)
- 14:00 ~ 15:30
- [P2-98]
- 14:00 ~ 15:30
- Title:Three Primary Color Single Emissive White Phosphorescent Organic Light-Emitting Devices on Glass and Flexible Substrate
- Jin Wook Kim, Seung Il Yoo, Jin Sung Kang (Hoseo Univ., Korea), Song Eun Lee, Ho Won Lee, Young Kwan Kim (Hongik Univ., Korea), and Woo Young Kim (Hoseo Univ., Korea)
Abstract: We fabricated white PHOLEDs on both glass substrate and polyethylene naphthalate (PEN) film flexible substrate. The performance of three primary color white PHOLEDs with single emissive layer on glass substrate, with different host materials of N,N¡¯-dicarbazolyl-3,5-benzene (mCP), 2',2',2''-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi) and 1:1 co-doped composition both mCP and TPBi as P-type, N-type and P-, N-type host materials, was analyzed and we found its luminous efficiency is closely related to Foster and Dexter energy transfer in host-dopant system and charge balance factor. White PHOLEDs with 1:1 co-doped composition both mCP and TPBi as host materials, yielded external quantum efficiency of 9.3 % at 8 V and a high luminous efficiency of 14.1 cd/A at 8 V with CIE color coordinates of (0.331, 0.384) at 7.5 V. The results reveal that the effective charge balance factor in white PHOLEDs with a formation of wide recombination zone (1?:1 co-doped composition both mCP and TPBi) allows improving the external quantum efficiency, as compared to the devices made with mCP and TPBi. And optimized (higher performance) structure of white PHOLEDs with 1?:1 co-doped composition both mCP and TPBi as host materials on galss substrate was applied to flexible white PHOLEDs. We found out its performances are similar to the white PHOLEDs on galss substrate. Fig. 1 shows plots of external quantum efficiency of white PHOLEDs on glass substrate as function of current density. We will continue additional experiments for white PHOLEDs on flexible substrate to compare with performances of white PHOLEDs on glass substrate.
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