甲基修饰的咔唑/二苯砜基AIE-TADF蓝光材料及其OLED器件  

Methyl-modified Carbazole/Diphenyl Sulfone-based AIE-TADF Blue Emitter and Its OLEDs

作　　者：伍泽鑫 朱渊杰 王泓中 王均安[2] 贺英[1] WU Zexin;ZHU Yuanjie;WANG Hongzhong;WANG Junan;HE Ying(Department of Polymer Materials,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Institute of Materials,School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China)

机构地区：[1]上海大学材料科学与工程学院高分子材料系,上海200444 [2]上海大学材料科学与工程学院材料研究所,上海200072

出　　处：《高等学校化学学报》2022年第11期87-97,共11页Chemical Journal of Chinese Universities

基　　金：国家教育部科学基金(批准号:18JDGC025)资助。

摘　　要：以四甲基咔唑为电子给体(D)、二苯砜为电子受体(A)构建了具有D-A-D结构的纯有机咔唑/二苯砜衍生物——9,9’-[磺酰基双(3,1-亚苯基)]双(1,3,6,8-四甲基-9H-咔唑)(TMe-m SOCz).对所合成材料的光物理性能研究表明,TMe-m SOCz表现出明显的聚集诱导发射(AIE)和热激活延迟荧光(TADF),延迟寿命和延迟荧光占比分别为2.26μs和47.7%,并具有良好的电化学稳定性和热稳定性.基于TMe-mSOCz作为非掺杂发光层制备了有机发光二极管(OLED)器件,其启亮电压(V_(on))为3.5 V,最大外量子效率为5.63%,国际照明委员会(CIE)坐标为(0.18,0.26).在1000 cd/m^(2)亮度下,非掺杂器件的效率滚降非常小(7.1%),色彩稳定性较好,其具有窄的半峰宽(FWHM=72 nm).研究结果表明,在传统TADF分子给受体间引入甲基修饰有利于开发具有AIE特性与更高效的D-A-D型TADF分子,这为基于AIE-TADF分子开发新型OLED器件提供了新途径.A pure organic carbazole/diphenyl sulfone derivative with D-A-D structure,9,9’-[sulfonylbis(3,1-phenylene)]bis(1,3,6,8-tetramethyl-9H-carbazole)(TMe-mSOCz),was constructed using tetramethyl carbazole as electron donor(D)and diphenyl sulfone as electron acceptor(A).The photophysical properties of the synthesized materials showed that TMe-mSOCz exhibited obvious aggregation-induced emission(AIE)and thermally activated delayed fluorescence(TADF),with delayed lifetime and delayed fluorescence accounting for 2.26μs and 47.7%,respectively,and good thermal and electrochemical stabilities.The organic light emitting diodes(OLEDs)fabricated based on TMe-mSOCz as the non-doped light-emitting layer exhibits a turn-on voltage(V_(on))of 3.5 V,the maximum external quantum efficiency of 5.63%,and the International Commission on Illumination(CIE)coordinates of(0.18,0.26).At 1000 cd/m^(2) brightness,the non-doped OLED device possesses a very low(7.1%)efficiency roll-off,good color stability,and a narrow full width at half maxima(FWHM)of 72 nm.The research results showed that the introduction of methyl modification between the receptors of traditional TADF molecules was beneficial to the development of D-A-D type TADF molecules with AIE characteristics and higher efficiency,which supplied a new route to OLED emitter fabrication based on AIE-TADF molecules.

关 键 词：热激活延迟荧光 聚集诱导发射 咔唑基二苯砜衍生物 有机发光二极管 非掺杂器件 

分 类 号：O622.7[理学—有机化学]