多糖基质诱导有机小分子室温磷光研究  

Polysaccharide Matrix-Induced Room-Temperature Phosphorescence of Organic Small Molecules

作　　者：谌业勤 陈金平[1] 于天君[1] 曾毅[1,2] 李嫕 Chen Yeqin;Chen Jinping;Yu Tianjun;Zeng Yi;Li Yi(Key Laboratory of Photochemical Conversion and Optoelectronic Materials,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190;University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国科学院理化技术研究所光化学转换与功能材料重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《化学学报》2023年第5期450-455,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.22090012,22273117)资助。

摘　　要：有机室温磷光材料在光电、传感和成像等领域具有重要的应用前景并受到广泛关注,发展环境友好的基质用于诱导室温磷光能为室温磷光材料的应用提供更多可行策略.本研究设计利用多糖作为基质诱导有机小分子产生室温磷光.研究发现1-萘甲酸(NA)在羧甲基纤维素钠、透明质酸钠和壳聚糖基质中均有室温磷光现象,室温磷光量子产率约0.03,在三种多糖基质中的磷光寿命分别为600,650和320ms.NA在高掺杂量时易形成激基缔合物以及发生三重态-三重态湮灭,导致磷光量子产率明显下降.4,4’-联苯二酚(BP)在三种多糖基质中没有形成激基缔合物,其中BP在羧甲基纤维素钠中的磷光量子产率约为0.05,并不随掺杂浓度的增加而降低,磷光寿命约1000 ms.红外光谱研究表明多糖基质与NA和BP发色团形成了氢键.多糖基质与发光分子间的氢键作用、基质的刚性环境以及对环境氧气的隔离三者共同作用,使有机小分子产生室温磷光. NA和BP掺杂的羧甲基纤维素钠溶液可以通过喷墨打印制备室温磷光图案.Organic materials capable of room-temperature phosphorescence have attracted much attention due to their potentials in the fields of optoelectronics,sensing and imaging.The development of environmentally friendly matrices for inducing room-temperature phosphorescence can provide feasible and sustainable ways for the applications.The present study was designed to achieve matrix-induced room-temperature phosphorescence using polysaccharides as dispersive substrates for organic small molecules.1-Naphthoic acid(NA)and 4,4'-biphenol(BP)were used as the chromophore to generate phosphorescence.NA and BP were doped in sodium carboxymethyl cellulose(CMC-Na),hyaluronic acid(HA)and chitosan,respectively.Room-temperature phosphorescence from NA and BP was observed in those doped polysaccharide films at ambient condition.The phosphorescence quantum yield of NA in the three polysaccharides was estimated to be about 0.03 and the average phosphorescence lifetime of NA in CMC-Na was estimated to be around 600 ms.The average phosphorescence lifetime of NA in HA and chitosan was estimated to be around 650 and 320 ms,respectively.The phosphorescence quantum yield decreased at high doping contents due to intermolecular quenching that may result from excimer formation and triplettriplet annihilation of NA.BP in CMC-Na presented a phosphorescence quantum yield of about 0.05,which did not decrease with the increase of doping concentration,and the phosphorescence lifetime was about 1000 ms.The phosphorescence quantum yield of BP in HA and chitosan is about 0.03 and 0.006,respectively.The average phosphorescence lifetime of BP in HA and chitosan was estimated to be around 740 and 210 ms,respectively.Infrared spectroscopic studies showed that the polysaccharide substrates formed hydrogen bonds with NA and BP chromophores.The combination of hydrogen bond formation between the matrix and the emissive molecules,the rigid environment of the matrix and the protection of the chromphore from ambient oxygen led to the observation of phosphorescenc

关 键 词：室温磷光 多糖 有机小分子 基质诱导室温磷光 

分 类 号：TB34[一般工业技术—材料科学与工程] O641.3[理学—物理化学]