有机电致发光器件中新型芴类小分子材料的光谱特性  

Spectral Characteristics of Novel Small Molecular Fluorene Derivative for Organic Light-Emitting Device

作　　者：钱锦程[1] 贾鲲鹏[2] 于军胜[1] 娄双玲[1] 蒋亚东[1] 张清[3] 

机构地区：[1]电子科技大学光电信息学院,电子薄膜与集成器件国家重点实验室,四川成都610054 [2]中国人民解放军63916部队,北京100142 [3]上海交通大学化学化工学院高分子科学与工程系,上海200240

出　　处：《光谱学与光谱分析》2010年第3期625-629,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金重点项目(60736005);国家自然科学基金创新群体项目(60721001);(863计划)项目(2007AA03Z424);教育部新世纪优秀人才计划项目(NCET-06-0812);电子科技大学中青年学术带头人计划项目(060206)资助

摘　　要：针对新型芴类小分子材料6,6-(′9H-fluoren-9,9-diyl)bis(2,3-bis(9,9-dihexyl-9H-fluoren-2-yl)qui-noxaline)(BFLBBFLYQ)和空穴传输材料N,N-′biphenyl-N,N-′bis-(3-methylphenyl)-1,1-′biphenyl-4,4-′di-amine(TPD)及二者混合体系的荧光光谱和吸收光谱进行了测试表征,制备了结构为indium-tin oxide(ITO)/BFLBBFLYQ∶TPD/Alq/Mg∶Ag的双层有机电致发光器件。研究发现,BFLBBFLYQ∶TPD混合薄膜存在一个不同于单独分子薄膜的低能量发射光谱,发光峰在530 nm处,与tris(8-hydroxyquinolinato)a-luminum(Alq)薄膜的荧光光谱相同,亦与结构为BFLBBFLYQ∶TPD/Alq双层器件的电致发光光谱相同。鉴于荧光染料4-(dicyanomethylene)-2-tert-butyl-6(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran(DCJTB)的吸收光谱与Alq的荧光光谱有很好的重叠,利用Forster能量传递理论,将DCJTB红色染料引入双层器件,通过调节掺杂位置,考察器件的发光光谱情况,进而对BFLBBFLYQ∶TPD/Alq双层器件的载流子复合区域进行了研究。结果表明,双层器件的载流子复合区域位于BFLBBFLYQ∶TPD/Alq界面附近的Alq层内。Double-layer organic light-emitting devices （OLEDs） based on a blend system of novel small molecule fluorene material 6,6＇-（9H-fluoren-9,9-diyl） bis（2,3-bis （9,9-dihexyl-gH-fluoren-2-yl） quinoxaline） （BFLBBFLYQ） and hole transporting material N, N＇-biphenyl-N, N r-bis-（ 3-methylphenyl）-1, 1＇-biphenyl-4, 4＇-diamine （TPD） were fabricated. The structure of the double-layer device was ITO/BFLBBFLYQ ： TPD/tris （8-hydroxyquinolinato） aluminum（Alq）/Mg ： Ag. The photoluminescence （PL） spectra of BFLBBFLYQ and TPD were located at 447 and 414 nm, respectively. The spectral characteristics of the blend system and the double-layer device were investigated, which indicated that a new long wavelength emission peaking at 530 nm was appeared both in PL spectra and eleetroluminescenee （EL） spectra. The exciplex between BFLBBFLYQ and TPD may play the role in long wavelength emission in the blend device and the spin-coated film. Based on the absorption spectra of a red fluo- rescent dye 4-（dicyanomethylene）-2-tert-butyl-6 （1,1,7,7-tetramethyljulolidyl-9-enyl）-4H-pyran （DCJTB） as probe and the PL spectra of the blend system showing good overlap, energy transfer from the blend system to DCJTB could be expected. Therefore, DCJTB could be selected as a molecular dopant to investigate the influence on EL spectra and the recombination of the devices. It was found that the excitons recombine at the interior Alq layer near to the BFLBBFLYQ ：TPD layer.

关 键 词：有机电致发光器件 芴类小分子 能量转移 复合区域 

分 类 号：TN383.1[电子电信—物理电子学]