Comparison of organic light emitting diodes with different mixed layer structures

Tou, Teck Yong and Yap, Seong Shan and Siew, Wee Ong and Kee, Yeh Yee (2014) Comparison of organic light emitting diodes with different mixed layer structures. Thin Solid Films, 570 (B). pp. 539-542. ISSN 0040-6090

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Abstract

A mixed-source thermal evaporation method was used to fabricate organic light emitting diodes (OLEDs) with uniformly mixed (UM), continuously graded mixed (CGM) and step-wise graded, mixed (SGM) light-emitting layers. N,N′-Bis(3-methylphenyl)-N,N′-diphenylbenzidine and Tris-(8-hydroxyquinoline)aluminum were used, respectively, as the hole- and electron-transport materials. As compared to the conventional, heterojunction OLED, the maximum brightness of UM-, CGM- and SGM-OLEDs without charge injection layers were improved by 2.2, 3.8 and 2.1 times, respectively, while the maximum power efficiencies by 1.5, 3.2 and 1.9 times. These improvements were discussed in term of more distributed recombination zone and removal of interfacial barrier.

Item Type: Article
Subjects: Q Science > Q Science (General)
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Suzilawati Abu Samah
Date Deposited: 05 May 2014 05:00
Last Modified: 19 Dec 2014 06:56
URI: http://shdl.mmu.edu.my/id/eprint/5452

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