新型蓝光OLED材料和器件

基于有机材料的电致发光技术可以应用于超薄平面显示和有机固体激光器等方面,在近20年来取得了飞速的发展,基本实现了红、绿、蓝三基色发光.绿色材料发展最快,基本达到了商业化实用阶段,而红色和蓝色材料的问题较多,特别是稳定、高效率的蓝光更具有挑战性.综述了近期我们对蓝光材料的分子设计与合成,以及蓝光器件的一些研究.主要包括金属络合物2,3-二甲基-8-羟基喹啉锂和聚芴衍生物树枝状的聚芴化合物的蓝光材料,以及利用基激复合态实现蓝光的电致发光器件.通过光致发光、电致发光光谱以及电压-电流-发光亮度特征曲线等研究了这些发光材料和器件的性质.现在蓝光器件的色纯度和工作寿命还有待提高.

Novel Blue Organic Light-emitting Diodes and Materials

The organic light-emitting diodes have been considered for applications in backlights of liquid-crystal displays,ultrathin plat full-color display,efficient illuminators and electro-pumped organic solid laser,etc.The process responsible for electroluminescence requires the injection of electrons from one electrode and holes from the other,the electron-hole pairs form excitons in emitting layer,and then the light generate through the radiative recombination of the excitons.In the past near upon twenty years,great progress has been made in electroluminescent devices and materials.Up to now,the three primary colors of red,green and blue,which are required for full-color displays,have been achieved.Among these,the green emission is the most perfect and the corresponding device almost reaches to commercial criterion.However,the blue and red emissions are more challenging,and there are many activities to be focused on efficient blue and red light-emitting materials.This paper reviews our recent works on blue organic light-emitting diodes,including blue materials,such as the metal chelate complex,(2,3-methyl-8-hydroxy-quinoline) lithium(LiMMq),and derivates of polyfluorene,dendritic polyfluorene(PDFA),and blue electroluminescent devices based on exciplex emission formed at the interface between9,9-Dibutyl-N,N,N',N'-tetraphenyl-9H-fluorene-2,7-diamine(DTFD) and 2,2-1,2-phenylenebis(oxy)] bis(N,N'-diphenyl-acetamide)(PBD).The performances of the blue emitting materials and the devices have been studied by photoluminescent,electroluminrescent spectra and characteristic of current-brightness-bias voltage etc.The life-time and color-purity of blue organic light-emitting diodes are required to be further improved for the commercial production.