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实验合成了发光二极管(LED)用绿光荧光粉配合物Tb-磺基水杨酸(SSAH)十一烯酸(UA)。红外光谱表明配体与Tb成功发生配位;紫外光谱分析表明配合物的吸收主要来自配体的吸收;荧光光谱分析显示配合物在365nm的紫外光激发下,于543nm处发出强的特征绿光,这表明所合成的配合物可用于365nm波长紫外芯片的光致荧光粉;热重曲线可以看出配合物的起始分解温度在200℃附近,完全满足LED的工作温度;荧光寿命分析得出配合物的荧光寿命为1.413ms,量子效率ηs=42%;通过量子化学计算出配体的单重态与三重态能级,并对配合物发光机理进行了探讨分析。
The green fluorescent powder complex Tb-sulfosalicylic acid (SSAH) undecylenic acid (UA) was synthesized experimentally. The results of FTIR showed that the coordination between ligand and Tb was successful. The UV absorption spectra showed that the absorption of the complex mainly came from the absorption of the ligand. Fluorescence spectroscopy showed that the complex emitted strong green light at 543nm under the excitation of 365nm UV light , Which indicates that the synthesized complexes can be used for photoluminescence of 365nm UV chip. The thermogravimetric analysis shows that the initial decomposition temperature of the complex is around 200 ℃, which fully satisfies the working temperature of LED. Fluorescence lifetime analysis The complex has a fluorescence lifetime of 1.413 ms and a quantum efficiency of ηs = 42%. The singlet and triplet energy levels of the ligand are calculated by quantum chemistry, and the luminescence mechanism of the complex is also discussed.