Stability of polymer light-emitting diodes

被引：39
|
作者：
Berntsen, AJM [1 ]
Van de Weijer, P [1 ]
Croonen, Y [1 ]
Liedenbaum, CTHF [1 ]
Vleggaar, JJM [1 ]
机构：
[1] Philips Res Labs, NL-5656 AA Eindhoven, Netherlands
来源：
PHILIPS JOURNAL OF RESEARCH | 1998年 / 51卷 / 04期
关键词：
electroluminescence; photoluminescence; light-emitting diodes; polymers; lifetime; carbonyl groups;
D O I：
10.1016/S0165-5817(98)00021-7
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this paper, we report on the lifetime of polymer LEDs fabricated at Philips Research. For single-layer LEDS, we find thar the operational lifetime in nitrogen gas is limited by the stability of the indium-tin-oxide (ITO) anode. By using a polymeric capping layer for the ITO, we obtain more stable devices. In air, the lifetime is limited by black spot formation. Small pinholes in the cathode layer are the origins of the black spots. Water or oxygen may diffuse through these pinholes and react with the cathode, causing degradation. By encapsulating the devices we can prevent black spot formation. Our present 8 cm(2) devices have lifetimes of many thousands of hours at daylight visibility under ambient conditions.
引用
收藏
页码：511 / 525
页数：15
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