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中文摘要：
在空穴传输层N，N＇-diphenyl—N，N’-bis-1-naphthyl-（1，1’-biphenyl）-4，4’-diamine（NPB）中掺杂电子传输材料Aluminium-tris-8-hydroxy-quinoline（Alqs）制备了有机电致发光器件。当掺杂浓度低于5％时器件仍为蓝光发射，但与同等结构没有掺杂的器件相比，蓝光器件的亮度提高了近20％，达到了12460cd／m^2，外量子效率提高了15．5％。随着掺杂浓度的增加，光谱发生了从蓝光到绿光的红移，这种掺杂方案能够改善空穴和电子的注入平衡，使得空穴和电子在发光层中能够有效地复合，器件的色度、亮度和效率都有了相应的改变。
英文摘要：
We have fabricated the organic light-emitting devices（OLEDs） by introducing the electron transmission material aluminium-tris-8-hydroxy-quinoline（Alq3）into hole transport layer N, N＇-diphenyl-N, N＇ -bis- 1-naphthyl- （ 1,1＇ -biphenyl ）-4,4＇-diamine （NPB）, whose doped concentration affects both color and efficiency of the devices. The OLED is still blue emission when the doped concentration of Alq3is below 5%, compared to the blue devices with a same structure, the brightness increases nearly 20%, up to 12460 cd/m^2, and quantum efficiency increases 15.5 %. The spectrum shifts from blue into green with increasing the doped concentration. The maximum efficiency and luminance of devices are all improved.
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