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设计并合成了四种基于10-甲基-10H-吩噻嗪-5,5-二氧化物为受体(A),9,9-二甲基-9,10-二氢吖啶(DMAC)或吩噁嗪(PXZ)为给体(D)的分子内电荷转移荧光化合物1a、1b、2a和2b,并研究它们的光物理和电化学性质.结果表明:2a甲苯溶液的最大发射波长(λmax)和除氧后的荧光量子效率(Φd)分别为422 nm和0.367,而1a和1b分别为455 nm、0.083和511 nm、0.098.室温下1a和1b掺杂的PMMA薄膜的荧光寿命(τfilm)分别为5.78和20.00μs.根据77 K时的时间分辨荧光和磷光光谱得到1a和1b的最低单重态(S_1)-最低三重态(T_1)的能级差ΔE_(ST)分别为0.203和0.177 e V,表明它们都是潜在的热激活延迟荧光(TADF)材料.热重分析表明四种化合物热分解温度高于420℃.
Four novel compounds based on 10-methyl-10H-phenothiazine-5,5-dioxide as acceptor (A), 9,9-dimethyl-9,10-dihydroacridine ) Or phenoxazine (PXZ) as donors (D), and their photophysical and electrochemical properties were investigated. The results show that the maximum emission wavelength of 2a toluene solution (λmax) and the fluorescence quantum efficiency (Φd) after deoxygenation were 422 nm and 0.367, respectively, while the values of 1a and 1b were 455 nm, 0.083 and 511 nm, respectively. The fluorescence lifetime of 1a and 1b doped PMMA films at room temperature (τfilm) were 5.78 and 20.00 μs, respectively.According to the time resolved fluorescence and phosphorescence spectra at 77 K, the energy difference ΔE_ (ST) of the lowest singlet state (S_1) and the lowest triplet state (T_1) of 1a and 1b were 0.203 And 0.177 e V, respectively, indicating that they are all potential heat-activated delayed fluorescence (TADF) materials.Thermal gravimetric analysis showed that the thermal decomposition temperatures of the four compounds were higher than 420 ℃.