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实现彩色显示需要高效率和高色纯度的红、绿、蓝三种颜色发光。与红、绿色器件相比,蓝光有机电致发光器件(OLED)有较低效率和较差的色纯度。为了改善器件性能,将微腔引入到OLED中,优化设计并制作出蓝色微腔有机电致发光器件(MOLED):Glass/DBR/ITO/NPB/DPVBi/Alq3/LiF/Al。得到蓝光微腔器件电致发光谱(EL)峰值位于472 nm,与无腔器件相比,峰值强度增强5.4倍,半峰全宽(FWHM)减小77.1%(仅为1 6 nm),光谱积分强度增加33%。微腔器件最大亮度8439 cd/m2,最大发光效率2.4 cd/A,CIE色坐标为(X=0.14;Y=0.10)。结果表明,由于微腔效应的存在,导致微腔器件的EL谱线窄化和峰值强度增强,可提高器件的色纯度,改善器件发光性能。
Achieve color display requires high efficiency and high color purity of the red, green and blue colors of light. Blue organic light-emitting devices (OLEDs) have lower efficiency and poorer color purity than red and green devices. In order to improve the device performance, the microcavity was introduced into the OLED to optimize the design and fabrication of a blue microcavity organic electroluminescent device (MOLED): Glass / DBR / ITO / NPB / DPVBi / Alq3 / LiF / Al. The peak of electroluminescence (EL) of the blue light microcavity device is at 472 nm, which is 5.4 times higher than that of the non-cavity device. The full width at half maximum (FWHM) decreases by 77.1% (only 16 nm) Points strength increased by 33%. The maximum brightness of the microcavity device is 8439 cd / m2, the maximum luminous efficiency is 2.4 cd / A, and the CIE color coordinate is (X = 0.14; Y = 0.10). The results show that due to the existence of the microcavity effect, the narrowing of the EL spectrum and the enhancement of the peak intensity of the microcavity device can improve the color purity of the device and improve the luminescence performance of the device.