Effect of a broad recombination zone with a triple-emitting layer on the efficiency of blue phosphorescent organic light-emitting diodes
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- 作者：Seok Jae Lee (1)
Ja Ryong Koo (1)
Ho Won Lee (1)
Song Eun Lee (1)
Hyung Jin Yang (1)
Seung Soo Yoon (2)
Jaehoon Park (3)
Young Kwan Kim (1) - 关键词：blue phosphorescent organic light ; emitting diodes ; new host material ; triple ; emitting layer
- 刊名：Electronic Materials Letters
- 出版年：2014
- 出版时间：November 2014
- 年：2014
- 卷：10
- 期：6
- 页码：1127-1131
- 全文大小：956 KB
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Ja Ryong Koo (1)
Ho Won Lee (1)
Song Eun Lee (1)
Hyung Jin Yang (1)
Seung Soo Yoon (2)
Jaehoon Park (3)
Young Kwan Kim (1)
1. Department of Information Display, Hongik University, Seoul, 121-791, Korea
2. Department of Chemistry, Sungkyunkwan University, Suwon, 440-746, Korea
3. Department of Electronic Engineering, Hallym University, Chuncheon, 200-702, Korea - ISSN：2093-6788
文摘
The device characteristics of blue phosphorescent organic lightemitting diodes (PHOLEDs) with a broad recombination region within emitting layers (EMLs) were investigated by changing the combination and the composition of the host materials. Six types of devices were fabricated with the novel host material 9-(4-(triphenylsilyl)phenyl)-9H-carbazole, hole transport-type host material N,N-dicarbazolyl-3,5-benzene, and electron transporttype host material 2,2-2-(1,3,5-benzenetriyl)tris-[1-phenyl-1H-benzimidazole] as diverse EML structures. Balanced chargecarrier injection and a distributed recombination zone within EMLs were achieved through a triple-emitting layer (T-EML). The properties of a device with a T-EML using a stepwise structure without any mixed host system were found to be superior to the other PHOLEDs. This can be explained in terms of improved charge balance and triplet-exciton confinement within the broad recombination region.