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ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 54, Number 3
JKCSEZ 54(3)
June 20, 2010 |
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Title |
Endothermic Forster Energy Transfer from DPVBi to BCzVBi in High Efficient Blue Organic Light-Emitting Diodes
고효율 청색 유기발광다이오드의 DPVBi와 BCzVBi 사이에서 발생하는 흡열 페르스터 에너지전이
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Author |
You Hyun Kim, Sang Youn Lee, Wook Song, Sung Sik Shin, Dae Hyun Ryu, Richard Wood, Jay Yatulis, Woo Young Kim*
김유현, 이상연, 송 욱, 신성식, 류대현, Richard Wood, Jay Yatulis, 김우영* |
Keywords |
유기발광디이오드, BCzVBi, DPVBi, 청색발광, 페르스터 에너지전이, 고효율
, OLED, DPVBi, BCzVBi, Blue emission, Foster energy transfer, High efficiency
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Abstract |
In this study, we demonstrated high-efficiency blue organic light-emitting diodes (OLEDs) employing BCzVBi as a blue fluorescent dye doped into blue host material, DPVBi with various concentration. The optimized blue OLED device having high-efficiency was constructed with structure of NPB (500 A) / DPVBi:BCzVBi-6% (150 A) / Alq3 (300 A) / Liq (20 A) / Al (1000 A). The maximum luminescence of blue OLED was 13200 cd/m2 at 13.8 V and current density and maximum efficiency were 26.4 mA/cm2 at 1000 cd/m2 and 4.24 cd/A at 3.9 V, respectively. Luminous efficiency shows two times higher than comparing with non-doped BCzVBi blue OLED whereas CIEx,y coordinate was similar with bare DPVBi blue OLED such as (0.16, 0.19). Electroluminescence of BCzVBi-6% doped blue OLED has two major peaks at 445 nm and 470 nm whereas pure DPVBi’s blue peak appears at 456 nm and it is happened through endothermic Forster energy transfer by molecule's vibration between LUMO of DPVBi as host material and LUMO of BCzVBi as dopant in device.
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291 - 294 |
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