Title: Interlayer Engineering with Different Host Material Properties in Blue Phosphorescent Organic Light-Emitting Diodes
Abstract: We investigated the light-emitting performances of blue phosphorescent organic light-emitting diodes, known as PHOLEDs, by incorporating an N,N’-dicarbazolyl-3,5-benzen interlayer between the hole transporting layer and emitting layer (EML). We found that the effects of the introduced interlayer for triplet exciton confinement and hole/electron balance in the EML were exceptionally dependent on the host materials: 9-(4-tert-butylphenyl)-3.6-bis(triphenylsilyl)-9H-carbazole, 9-(4-tert-butylphenyl)-3.6-ditrityl-9H-carbazole, and 4,4’-bis-triphenylsilanyl-biphenyl. When an appropriate interlayer and host material were combined, the peak external quantum efficiency was greatly enhanced by over 21 times from 0.79% to 17.1%. Studies on the recombination zone using a series of host materials were also conducted.
Publication Year: 2011
Publication Date: 2011-02-07
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 30
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot