Effects of the Thickness of N,N-diphenyl-N,N-di(m-tolyl)-benzidine on the Electro-Optical Characteristics of Organic Light-Emitting Diodes
- Authors
- Park, Sang-Geon; Lee, Won Jae; Song, Min Jong; Shin, Johngeon; Kim, Tae Wan
- Issue Date
- 2-Mar-2019
- Publisher
- MDPI
- Keywords
- organic light-emitting diode; current density; current efficiency
- Citation
- MATERIALS, v.12, no.6
- Journal Title
- MATERIALS
- Volume
- 12
- Number
- 6
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/1863
- DOI
- 10.3390/ma12060966
- ISSN
- 1996-1944
- Abstract
- We examined the electro-optical characteristics of organic light emitting diodes according to the N,N-diphenyl-N,N-di(m-tolyl)-benzidine (TPD) thicknesses. The thicknesses of TPD were varied from 5 nm to 50 nm. The current density of the device with a TPD thickness of 5 nm was 8.94 times higher than that with a thickness of 50 nm at a driving voltage of 10 V. According to the conduction-current characteristics of conductors, the current densities improved with a decreasing TPD thickness. Different from the current density-voltage characteristics, the current efficiency-current density characteristics showed an improved efficiency with a 50 nm TPD thickness. The current efficiencies of a device with a 5 nm TPD thickness at a driving voltage of 10 V was 0.148 and at a 50 nm TPD thickness 0.993 cd/A, which was 6.7 times higher than the 5 nm TPD thickness. These results indicated that hole transport in Organic Light-Emitting Diode (OLED) devices were more efficient with thin 5 nm TPD than with thick 50 nm TPD, while electron transport was more efficient with thick 50 nm TPD, which caused conflicting results in the current efficiency-current density and current density-voltage characteristics according to TPD thicknesses.
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Collections - College of Engineering > Department of Science > 1. Journal Articles
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