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光学微腔是指尺寸在光波长量级的光学微型谐振腔。微腔结构可以使腔内物质和光场的相互作用与体材料相比发生很大变化,出现了自发辐射谱线窄化和增强等腔效应。利用这些腔效应,可以改善有机发光器件的性能。采用微腔结构,优化设计并研制了有机微腔绿色发光二极管,器件结构为Glass/DBR/ITO/NPB/Alq∶Rubrene/Alq/MgAg,获得了最大亮度40100 cd/m2、最大发光效率为6.44 cd/A、半峰全宽为28 nm的纯绿色有机微腔电致发光器件。而与之比较的无腔器件最大亮度为22580 cd/m2、最大发光效率为2.98 cd/A、半峰全宽为120 nm。相同电流密度下微腔电致发光谱的峰值发射强度是无腔器件的4.2倍。结果表明将微腔结构引入有机电致发光器件中,不但改善了发光的色纯度,而且使器件的发光效率和亮度都得到明显增强。
An optical microcavity refers to an optical microresonance that is on the order of light wavelength. The microcavity structure can greatly change the interaction between the material and the light field in the cavity compared with the bulk material, resulting in narrowing of the spontaneous emission spectrum and enhancement of the cavity effect. With these cavity effects, the performance of the organic light emitting device can be improved. The structure of the device is glass / DBR / ITO / NPB / Alq: Rubrene / Alq / MgAg. The maximum brightness is 40100 cd / m2 and the maximum luminous efficiency is 6.44 cd / A, a pure green organic microcavity electroluminescent device with a full width at half maximum of 28 nm. In comparison, the maximum luminosity of the device with no cavity is 22580 cd / m2, the maximum luminous efficiency is 2.98 cd / A, and the full width at half maximum is 120 nm. The peak emission intensity of the microcavity electroluminescence spectrum at the same current density is 4.2 times higher than that of the cavityless device. The results show that the introduction of microcavity structure into the organic electroluminescent device not only improves the color purity of the luminescence, but also greatly enhances the luminous efficiency and brightness of the device.