两种宽谱带蓝光发射材料的制备、表征及光学特性  

Synthesis,Characterization and Photoluminescent Properties of two Blue-light-emitting Materials

作　　者：许慧侠[1] 陈柳青[1] 陈简[1] 王华[1] 刘旭光[1] 许并社[1] 

机构地区：[1]新材料界面科学与工程省部共建教育部重点实验室

出　　处：《发光学报》2008年第1期32-36,共5页Chinese Journal of Luminescence

基　　金：国家自然科学基金(20671068);山西省自然科学基金(20041066);山西省留学人员科研(200523);山西省工业攻关(2006031121)资助项目

摘　　要：合成了两种以钙为中心金属离子的有机电致发光材料2-(2-羟基苯基)苯并噻唑钙Ca(BTZ)2和2-(2-羟基苯基苯并噻唑)-(1,10-邻菲罗啉)合钙Ca(BTZ)2phen。通过红外光谱、紫外-可见光吸收光谱、循环伏安曲线、原子力显微镜以及光致发光光谱表征了材料的结构、光学带隙、能带结构、成膜性以及光学性能。实验结果表明,在DMSO溶液中,Ca(BTZ)2的紫外吸收峰主要为290,330,422nm;Ca(BTZ)2phen的紫外吸收峰主要为292,330,428nm。Ca(BTZ)2的荧光发射峰为458nm和500nm,色坐标为x=0.2176,y=0.3223;Ca(BTZ)2phen的荧光发射峰主要为465nm和514nm,色坐标为x=0.2418,y=0.3817。利用真空热蒸镀法可以得到均匀致密的Ca(BTZ)2phen的薄膜,其粗糙度为1.56。Ca(BTZ)2薄膜也有望通过旋涂制备。实验发现Ca(BTZ)2与Ca(BTZ)2phen的荧光光谱几乎覆盖整个可见光区域,为宽谱带发光材料,有望设计成合理的器件结构实现白光发射。In the last few years, organic electroluminescent devices （OLEDs） have been the subject of increasing interest due to their potential impact on lighting industry and back lighting application. In order to optimize the device structure and explore the marketable OLEDs, researchers are synthesizing high performance emitting materials with desirable properties. So far, many new materials with RGB （red, green, blue） emi-ssion have been developed to meet this requirement. However, in contrast to green-light-emitting materials, blue-light-emitting materials still need to be further improved in performance. In this paper, two blue-light-emitting materials, Ca （ Ⅱ ） complex of aromatic N, O-chelate ligand, namely Ca （BTZ）2 and Ca （BTZ） 2 phen [ BTZ ：2-（2-hydroxyphenyl） benzothiazolate, phen ： 1,10-phenanthroline ], were synthesized and charac-terized by FT IR and UV-Vis absorption spectra. Their energy band, photoluminescent property, and film-forming ability were investigated by UV-Vis absorption spectra, cyclic vohammetry, atomic force microscope, and photoluminescent spectra. The results show that the UV-Vis absorption bands of Ca（BTZ） 2 are located at about 290, 330 and 422 nm, while, UV-Vis absorption bands of Ca（BTZ）2phen are located at 292, 330 and 428 nm. The 290 nm or 292 nm bands, which are S0→S1 transition, are attributed to the local π→π^＊ transition of the deprotonated ligands. The broad bands of 330 nm can be assigned to a phenoxido-to-thiazolyl π→π^＊ transition. The bands of 422 nm or 428 nm, which correspond to the transition of HOMO to LUMO, are mainly caused by the charge transition from electron donor O to electron acceptor N. The optical gap, the energy of the highest occupied orbital （EHOMO ） , and the energy of the lowest unoccupied orbital （ELUMO） of Ca （BTZ） 2 are 2.79, 5.74 and 2.95 eV, respectively. The values of optical gaps, EHOMO and ELUMO of Ca（BTZ） 2phen are 2.77, 5.8 and 3.03 eV, respectively. The increased degree of conju

关 键 词：2-(2-羟基苯基)苯并噻唑钙 2-(2-羟基苯基)苯并噻唑-(1 10-邻菲罗邻)合钙 光学性能 白光发射 

分 类 号：TN383.1[电子电信—物理电子学] TN873.3