Effects of Doping Concentration and Emission Layer Thickness on Recombination Zone and Exciton Density Control in Blue Phosphorescent Organic Light-Emitting Diodes
- Authors
- Jesuraj, P. Justin; Hafeez, Hassan; Rhee, Sang Ho; Kim, Dong Hyun; Song, Myungkwan; Kim, Chang Su; Ryu, Seung Yoon
- Issue Date
- 2017
- Publisher
- ELECTROCHEMICAL SOC INC
- Citation
- ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY, v.6, no.12, pp.R170 - R174
- Indexed
- SCIE
SCOPUS
- Journal Title
- ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
- Volume
- 6
- Number
- 12
- Start Page
- R170
- End Page
- R174
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/86316
- DOI
- 10.1149/2.0321712jss
- ISSN
- 2162-8769
- Abstract
- Herein, we evaluate the effects of the doping concentration and emissive layer (EML) thickness to control the recombination zone (RZ) and exciton density (ED) in blue phosphorescent organic light-emitting diodes (Ph-OLEDs). Varying the doping concentration of the guest molecule iridium-(III)-bis-[(4,6-difluorophenyl)-pyridinato-N,C2'] picolinate (FIrpic) in host materials together with different EML thicknesses induced a change in the RZ and ED and also influenced the quenching of triplet excitons. Increasing the dopant concentration in the 20 nm EML generated a wider RZ and greater ED and induced a blueshift in the electroluminescence spectrum, whereas a redshift in the electroluminescence (EL) spectrum was observed in the case of the 30 nm EML. It is proposed that the micro-cavity effect (around 500 nm), shift of the RZ and ED along with band alignment tactics were operative for improving the performance of the blue Ph-OLEDs. (c) 2017 The Electrochemical Society. All rights reserved.
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