蓝光OLED的掺杂研究

采用蓝色发光材料ADN为主体发光材料、BAlq3为掺杂材料,通过改变BAlq3的掺杂浓度制备了结构为ITO/NPB/ADN:BAlq3/Alq3/Mg:Ag的一系列蓝光有机发光器件(OLED).研究了器件各有机层之间的能级匹配和BAlq3的掺杂浓度对载流子注入、传输、复合以及发光色纯度的影响.实验结果表明,空穴阻挡材料BAlq3的掺入显著影响OLED的电流密度、发光亮度、发光效率和发光光谱,当BAlq3的掺杂浓度为25%时,OLED的发光效率为1.0 lm/W,发光光谱的峰值为440 nm,色纯度为(0.18,0.15),未封装器件的半衰期为950小时,器件同时满足了高效率和高色纯度的要求.

Investigation on doped blue organic light-emitting devices

Blue host material 9,10-di-(2-naphthyl)anthracene(ADN)was doped with Aluminum(Ⅲ)bis(2-methyl-8-quinolinato)4-phenylphenolato(BAlq3),and the concentration of BAlq3 was changed,then structure of ITO/NPB/ADN∶BAlq3/Alq3/Mg∶Ag were fabricated in the vacuum. The impact of energy-match and BAlq3 dopant concentration on the carrier injection,transport,recombination and the color purity of the devices were analyzed. The experiment results show that BAlq3 dopant influence the current density,luminance,efficiency and color purity of the devices. When the BAlq3 dopant concentration is about 25%,the luminous efficiency is 1.0 lm/W,the spectrum at 440 nm,the CIE chromaticity(0.18,0.15),and the half life of unseal device is about 950 hours,which achieve both the high efficiency and good color purity.