Citation

Yap, Seong Shan and Ong, Teng Sian and Ong, Guang Liang and Tou, Teck Yong and Kee, Yeh Yee (2019) Optimisation of graded-mixed transport organic light emitting diode via mixed-source thermal evaporation technique. Microelectronic Engineering, 213. pp. 62-68. ISSN 0167-9317

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Abstract

Continuously graded-mixed transport organic light emitting diodes (CGM-OLED) have been fabricated using the mixed-source thermal evaporation method. Different CGM composition profiles can be controlled by the heating ramp rate, and validated by the X-ray photoelectron spectroscopy depth-profiling measurements. With external charge injection, the transport sub-layers formed in-situ at both sides of the CGM region, can act to confine the charges in the central emissive region, or recombination zone; adding charge-blocking layers may degrade the OLED performance. An optimised Alq3-based CGM-OLED was operated at low turn-on voltage of 2.8 V, which delivered maximum luminance, luminance efficiency and power efficiency of 21,135 cd/m2, 5.1 cd/A and 3.1 lm/W, respectively, and retained >80% of the maximum luminance efficiency between 100 and 15,000 cd/m2.

Item Type:	Article
Uncontrolled Keywords:	Fluorescent OLED Continuously graded-mixed transport Mixed-source thermal evaporation In-situ charge confinement
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK4125-4399 Electric lighting
Divisions:	Faculty of Engineering (FOE)
Depositing User:	Ms Suzilawati Abu Samah
Date Deposited:	07 Mar 2022 01:26
Last Modified:	07 Mar 2022 01:26
URII:	http://shdl.mmu.edu.my/id/eprint/9211

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