Study on lifetime of high brightness green organic light-emitting devices

Zhuo Gao; Jian Zhong; Junsheng Yu; Yadong Jiang

doi:10.1117/12.866298

22 October 2010 Study on lifetime of high brightness green organic light-emitting devices

Zhuo Gao, Jian Zhong, Junsheng Yu, Yadong Jiang

Proceedings Volume 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology; 76583M (2010) https://doi.org/10.1117/12.866298
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

Abstract

To analyze why the device degrade, we have processed the pictures, which we got when the device degraded, with Matlab programs. The areas of dark spots in the pictures were calculated quantitatively. And we also got the effective light-emitting area and the proportion of dark spots. Comparing and contrasting the attenuation curve of the lightemitting area and the luminance, we could study further the reasons why the device degraded and know how to improve the operation lifetime of device. In this study, a kind of high brightness green organic light-emitting diode was selected as the research object, with a typical OLED multilayer structure, ITO/CuPc/α-NPD/Alq₃:C545T/Alq₃/LiF/Al. The device started working required only 2.5 V, with a emitting peak at 525 nm and maximum luminous efficiency 3.92 lm•W^-1.The brightness of the device was measured to be 2500 cd•m^-2 at the drive voltage 20 V. To restrain the permeation of vapor and oxygen into the device, it was encapsulated in low vacuum and high purity of nitrogen. It was a effective way to protect the device and ensure all kinds of device properties steady. Nevertheless, it's inevitable that vapor and oxygen permeated into the device due to the porosity of epoxy resin. The results showed that vapor and oxygen both would result in the light-emitting area decrease. On the one hand, vapor would peel away the cathode from the organic layer and bring in some bubbles; on the other hand oxygen would cause oxidation of cathode and organic layer. As a result, the dark spots appeared, grew up, and finally attached together forming a non-emitting area.

Citation Download Citation

Zhuo Gao, Jian Zhong, Junsheng Yu, and Yadong Jiang "Study on lifetime of high brightness green organic light-emitting devices", Proc. SPIE 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology, 76583M (22 October 2010); https://doi.org/10.1117/12.866298

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KEYWORDS

Organic light emitting diodes

Oxygen

Electrodes

Image processing

Signal attenuation

Electroluminescence

MATLAB

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