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학술지 Stable Efficiency Roll-Off in Blue Phosphorescent Organic Light-Emitting Diodes by Host Layer Engineering
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저자
이종희, 이정익, 이준엽, 추혜용
발행일
200912
출처
Organic Electronics, v.10 no.8, pp.1529-1533
ISSN
1566-1199
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.orgel.2009.08.020
협약과제
08IB3200, 고효율 백색 OLED 소자 기술 개발, 추혜용
초록
The device characteristics of blue phosphorescent organic light-emitting diodes (PHOLEDs) with mixed host structure were investigated by changing the combination and the composition of host materials in emissive layer. The distributed recombination zone and balanced charge carrier injection within emissive layer were achieved through mixed host optimization with a hole transport-type and an electron transport-type host materials, therefore the device performances were greatly enhanced, with external quantum and power efficiencies of 21.8% and 53 lm/W. Moreover, mixed host blue PHOLEDs exhibited a extremely low stable efficiency roll-off with quantum efficiencies of 20.3% and 18.6% at a luminance of 1000 and 10,000 cd/m2. © 2009 Elsevier B.V. All rights reserved.
키워드
Deep blue phosphorescent, Mixed host structure, Organic light-emitting diodes (OLED), Roll-off
KSP 제안 키워드
Blue phosphorescent organic light-emitting diodes, Charge carrier injection, Deep blue, Device characteristics, Efficiency roll-off, Electron Transport, Hole transport, Organic light-emitting diodes(OLEDS), Quantum Efficiency, Recombination zone, blue PHOLEDs