荧光素基PGMA的合成及其发光性能  

Synthesis and Photoluminescence Properties of Fluorescein-Based Poly(glycidyl methacrylate)

作　　者：刘斌 王亚玲 储波 段汉一 李杨 王慧奇 胡胜亮 张兴宏[2] LIU Bin;WANG Yaling;CHU Bo;DUAN Hanyi;LI Yang;WANG Huiqi;HU Shengliang;ZHANG Xinghong(School of Energy and Power Engineering,North University of China,Taiyuan 030051,China;MOE Key Laboratory of Macromolecular Synthesis and Functionalization,Department of Polymer Science and Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]中北大学能源动力工程学院,太原030051 [2]浙江大学高分子科学与工程学系,高分子合成与功能构造教育部重点实验室,杭州310027

出　　处：《功能高分子学报》2021年第5期460-467,共8页Journal of Functional Polymers

基　　金：国家自然科学基金(52003254,51973190);山西省应用基础研究计划项目(201901D211262,201901D211282);浙江大学高分子合成与功能构造教育部重点实验室开放课题(2020MSF01)。

摘　　要：以传统具有聚集诱导猝灭(ACQ)效应的荧光素作为引发剂、甲基丙烯酸缩水甘油酯(GMA)为单体,通过原子转移自由基聚合(ATRP)将荧光素引入到聚甲基丙烯酸缩水甘油酯(PGMA)中,制得荧光素位于链中央的荧光素基PGMA(Flu-PGMA)。采用差示扫描量热、热重分析、稳态和瞬态荧光光谱等对Flu-PGMA的热学性能和荧光性能进行了表征,并利用PR655光谱仪对白光发光二极管(LEDs)的器件性能进行了研究。结果表明:PGMA克服了小分子荧光素的ACQ效应,Flu-PGMA的数均分子量为2.64×10^(4),分子量分布为1.5,固态荧光量子产率达14.27%。将其作为单一基质固态荧光粉,在460 nm InGaN蓝光芯片激发下,当驱动电压为2.7 V时,制得显色指数为84的白光发光LEDs器件,其相关色温为9455K,色坐标为(0.289,0.282),位于白光区域。Fluorescein(Flu)was introduced into poly(glycidyl methacrylate)(PGMA)chains by atomic transfer radical polymerization(ATRP)and fluorescein-based PGMA(Flu-PGMA)was prepared by using traditional fluorescein with aggregation induced quenching(ACQ)effect as initiator and glycidyl methacrylate(GMA)as monomer.The thermal and fluorescence properties of Flu-PGMA were characterized by differential scanning calorimetric,thermogravimetric analysis,steady-state and transient-state fluorescence spectrometers,and the device properties of white light-emitting diodes(LEDs)were investigated by PR655 spectrometer.The results showed that PGMA could overcome the ACQ effect of fluorescein,and the number-average molecular weight was 2.64×10^(4) and polydispersity of Flu-PGMA was 1.5.The glass transition temperature and thermal decomposition temperature of Flu-PGMA could reach up to 79.8℃ and 280℃, and its excellent thermal properties satisfy the needs of a phosphor. In addition, the Flu-PGMA presented excellent visible light transmittance of 64%-68% in a wavelength range of 400-800 nm. The solid-state fluorescence quantum yield of Flu-PGMA could reach up to 14.27%. The photoluminescence spectra exhibited excitation-independent characteristics and the strongest emission peak was located at 550 nm, which belongs to yellow emission. The average fluorescence decay lifetime fitted by biexponential function was 4.55 ns. When it was applied as a single-phase solid phosphor, a white LED with a color rendering index of 84 was fabricated under the excitation of 460 nm InGaN blue chip at a driving voltage of 2.7 V, which is higher than that of fluorescein-based LEDs reported at present. The correlated color temperature was 9 455 K and the color coordinates were located at (0.289, 0.282), which belongs to the white gamut.

关 键 词：原子转移自由基聚合 荧光粉 发光二极管 荧光素 聚甲基丙烯酸缩水甘油酯 

分 类 号：O63[理学—高分子化学]