논문 해외 국제전문학술지(SCI급) Analysis of the Characteristics of Organic Light-Emitting Diodes with Single and Mixed Host EML by Impedance Spectroscopy
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2023-09
- 저자명 Su-Ji Kim, Akeem Raji, Akpeko Gasonoo, Jonghee Lee, and Jae-Hyun Lee
- 학술지명 Organic Electronics
- 발행처명 ScienceDirect
- 발행국가 해외
- 논문언어 한국어
- 전체저자수 5
홈페이지논문 초록 (Abstract)
Impedance spectroscopy was used to investigate the charge transportation and accumulation mechanisms in a mixed-host emissive layer (EML) of phosphorescent organic light-emitting diodes (OLEDs). 1, 3, 5-tris(1-phenyl-1H-benzimidazole-2-yl)benzene (TPBi) and 4, 4′, 4″-tris(N-carbazolyl)-triphenylamine (TCTA) materials were used as the electron transport and hole transport layers, respectively, to fabricate the mixed-host EML device. The results showed enhanced current and power efficiency owing to the use of the same material as the mixed-host EML, eliminating energy barriers within the device, coupled with the negative interfacial charges in the polarized TPBi material. The hole- and electron-split devices of the mixed-host EML OLED were analyzed to comprehensively understand the enhanced electrical properties within the device. Subsequently, the capacitance-frequency (C–F) characteristics of the devices were simulated with an equivalent circuit to quantitatively determine the capacitance and resistance in each organic layer at specific voltages (0–4 V) representing each characteristic step on the capacitance-voltage (C–V) curve.