상세정보
학술지
Investigation of Double Emissive Layer Structures on Phosphorescent Blue Organic Light-Emitting Diodes
- 발행일
- 200907
- 출처
- Synthetic Metals, v.159 no.14, pp.1460-1463
- ISSN
- 0379-6779
- 출판사
- Elsevier
- 협약과제
- 08IB3200, 고효율 백색 OLED 소자 기술 개발, 추혜용
- 초록
- The performances of blue phosphorescent organic light-emitting diodes (PHOLEDs) at high current densities have been investigated with double emissive layer structures (D-EMLs). The D-EMLs are comprised of two emissive layers with a hole-transport-type host of N,N??-dicarbazolyl-3,5-benzene (mCP) and an electro transport-type ultrawide band-gap host of m-bis-(triphenylsilyl)benzene (UGH3) both doped with a blue electro-phosphorescent dopant of iridium(III)bis(4,6-difluorophenyl-pyridinato-N,C2??) picolinate (FIrpic). The expansion of hole/electron recombination zone in D-EMLs has been successfully achieved by controlling of each EML properties, therefore external quantum efficiency, especially at high current density region was significantly enhanced. Moreover, the blue PHOLED with D-EMLs showed substantially reduced roll-off with the external quantum efficiency of 10.0% at 5000 cd/m2. © 2009 Elsevier B.V. All rights reserved.
- KSP 제안 키워드
- Band gap, Blue phosphorescent organic light-emitting diodes, Electron recombination, External Quantum Efficiency, Hole transport, Layer structure, Organic light-emitting diodes(OLEDS), Recombination zone, Roll-off, Ultra-Wide Band(UWB), blue PHOLEDs