Optical characteristics of organic green-light-emitting devices: Finite element approach

In this paper, we report our theoretical study on the electrical and optical properties of organic light-emitting-diode (OLED) devices based on the green emitter tris(8-hydroxyquinolinato)aluminum (Alq3). The electrical analysis of the bilayer structure has been carried out in order to identify and...

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Published inJapanese Journal of Applied Physics Vol. 53; no. 8S3; pp. 8 - 1-08ND01-3
Main Authors Hwang, Youngwook, Lee, Hyeongi, Won, Taeyoung
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.08.2014
Subjects
Bragg reflectors
Carriers
Devices
Emission
Emittance
Finite element method
Luminance
Mathematical analysis
Optical properties
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Summary:In this paper, we report our theoretical study on the electrical and optical properties of organic light-emitting-diode (OLED) devices based on the green emitter tris(8-hydroxyquinolinato)aluminum (Alq3). The electrical analysis of the bilayer structure has been carried out in order to identify and understand the behavior of carriers. After investigating the behavior of carriers, we devised a bottom mirror between the anode and the substrate to improve the luminance efficiency. Using the bottom mirror as the distributed Bragg reflector (DBR), we could attain an improvement of 17% in emission efficiency and sharper emission characteristics. Also, we found that the chromaticity of the device varies with the geometry of the bottom mirror.
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ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.53.08ND01