High operating temperature stable OLEDs with reduced reflectivity cathodes

Popovic, Zoran D.; Aziz, Hany; Vamvounis, George; Hu, Nan-Xing; Paine, Tony

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자료유형: 학술대회자료

저자정보: Popovic, Zoran D. (Xerox Research Centre of Canada) Aziz, Hany (Xerox Research Centre of Canada) Vamvounis, George (Xerox Research Centre of Canada) Hu, Nan-Xing (Xerox Research Centre of Canada) Paine, Tony (Xerox Research Centre of Canada)

저널정보: 한국정보디스플레이학회 한국정보디스플레이학회 International Meeting 한국정보디스플레이학회 2003년도 International Meeting on Information Display

발행연도: 2003.1

수록면: 21 - 24 (4page)

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The understanding of the mechanism of device degradation has been accomplished recently, for devices using $AlQ_3$ electron transport and emitter molecule. In this presentation the experimental evidence for the degradation mechanism of $AlQ_3$ based devices will be reviewed, showing that the hypothesis of an unstable $AlQ_3^+$ cation explains a large amount of experimental data. This hypothesis, however, explains not only the room temperature device degradation in time but also sheds light on temperature stability of OLEDs. Dependence of half-life of a series of devices with an emitter layer composed of a mixture of $AlQ_3$ and different hole transport molecules (mixed emitter layer) will be discussed when they are operated at elevated temperatures. These results can also be explained in the framework of an unstable $AlQ_3^+$ species. An OLED structure containing a doped mixed emitter layer will be described, which shows extraordinary stability, half-life of 1200 hours at operating temperature of 70 C and initial luminance of 1650 $cd/m^2$. We will also discuss a novel Black $Cathode^{TM}$ OLED with reduced optical reflectivity, which is also stable at elevated temperatures. The new cathode utilizes a conductive light-absorbing layer made of a mixture of metals and organic materials.

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