Synergetic Influences of Mixed-Host Emitting Layer Structures and Hole Injection Layers on Efficiency and Lifetime of Simplified Phosphorescent Organic Light-Emitting Diodes
- Authors
- Han, Tae-Hee; Kim, Young Hoon; Kim, Myung Hwan; Song, Wonjun; Lee, Tae-Woo
- Issue Date
- Mar-2016
- Publisher
- AMER CHEMICAL SOC
- Keywords
- organic light-emitting diodes; simple structure; mixed host; degradation mechanism; lifetime; nondestructive analysis; transient electroluminescence; capacitance-voltage
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.8, no.9, pp 6152 - 6163
- Pages
- 12
- Indexed
- SCI
SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 8
- Number
- 9
- Start Page
- 6152
- End Page
- 6163
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/194300
- DOI
- 10.1021/acsami.5b11791
- ISSN
- 1944-8244
1944-8252
- Abstract
- We used various nondestructive analyses to investigate various host material systems in the emitting layer (EML) of simple-structured, green phosphorescent organic light-emitting diodes (OLEDs) to clarify how the host systems affect its luminous efficiency (LE) and operational stability. An OLED that has a unipolar single-host EML with conventional poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) showed high operating voltage, low LE (similar to 26.6 cd/A, 13.7 lm/W), and short lifetime (similar to 4.4 h @ 1000 cd/m(2)). However, the combined use of a gradient mixed-host EML and a molecularly controlled HIL that has increased surface work function (WF) remarkably decreased operating voltage and improved LE (similar to 68.7 cd/A, 77.0 lm/W) and lifetime (similar to 70.7 h @ 1000 cd/m(2)). Accumulated charges at the injecting interfaces and formation of a narrow recombination zone close to the interfaces are the major factors that accelerate degradation of charge injection/transport and electroluminescent properties of OLEDs, so achievement of simple-structured OLEDs with high efficiency and long lifetime requires facilitating charge injection and balanced transport into the EMI, and distributing charge carriers and excitons in EML.
- Files in This Item
-
Go to Link
- Appears in
Collections - 서울 공과대학 > 서울 에너지공학과 > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/194300)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.