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IJEMS Vol.12(4) [August 2005] >


Title: Blue-green emission from organic light emitting diodes based on aluminum complex
Authors: Misra, Aparna
Kumar, Pankaj
Kumar, Lokendra
Ganesh, Nikhil
Gupta, Mohit
Dhawan, S K
Kamalasanan, M N
Chandra, Subhas
Issue Date: Aug-2005
Publisher: CSIR
IPC CodeG02B6/00, H01L29/861
Abstract: Bluish-green emission from double layer organic light emitting diode (OLED), based on an aluminium complex, bis-(2-methyl 8-hydroxyquinoline) aluminium hydroxide (Almq2OH), as an emissive material and N,N'-bis(3-methylphenyl)-N,N'-bis(phenyl)benzidine (TPD), as hole transport material with an electro-luminescence maximum at 506 nm, has been reported. The good thermal stability, good performance for the OLED applications, and a noticeable blue shift in the electroluminescence, in comparison to Alq3, make this Al complex a good contender for OLED applications for light emission in the blue-green region. It was also found that the devices based on this material have a slightly higher turn-on voltage than similar Alq3 devices. This can be attributed to the higher energy-gap of the material. The photoluminescence and electroluminescence spectra are reported and a shift of 9 nm in peaks is observed. The current-voltage characteristics of the device have also been studied.
Page(s): 321-324
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Source:IJEMS Vol.12(4) [August 2005]

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