808 nm激光诱导下的钨酸盐上转换绿光材料研究

Study of green luminescent materials in tungstate by 808 nm laser excitation for up-conversion

对于发光材料来说,基质的选择可以对其性能的改善起到至关重要的作用。钨酸盐是一种无机基质材料,具有反射率较高、稳定性能好以及合成工艺简单等优点。NaGd(WO_(4))_(2):Nd^(3+)/Er^(3+)荧光材料由于其固有特性而具有很强的上转换发光,一方面,NaGd((WO_(4))_(2)具有比氟化物和其他氧化物基质材料更好的稳定性;另一方面,Nd^(3+)在808 nm附近有相对较大的吸收截面。因此,利用上转换发光机理,选取NaGd((WO_(4))_(2)作为基质材料,利用其比氟化物性质稳定的优点,再掺杂Nd^(3+)和Er^(3+),充分考虑到用Nd^(3+)吸收截面大的长处来弥补不足,在808 nm激光的诱导下,以期达到发光性能较好的绿色发光材料设计。实验研究结果表明NaGd((WO_(4))_(2):5%Nd^(3+)/2%Er^(3+)是最佳的设计组合,808 nm激光的最佳功率为283 mW。

For luminescent materials,the choice of the matrix can play a crucial role in improving the luminescent properties of the material.Tungstate is an inorganic matrix material with such advantages as high reflectivity,stable performance and simple synthesis process.NaGd((WO_(4))_(2):Nd^(3+)/Er^(3+) fluorescent material has strong up-conversion luminescence due to its inherent characteristics.On the one hand,NaGd((WO_(4))_(2) has better stability than fluoride and other oxide matrix materials;on the other hand,Nd^(3+)has a relatively large cross-section for absorption at around 808 nm.Therefore,by using the up-conversion luminescence mechanism,this study selects NaGd((WO_(4))_(2) as the matrix material for its stabler performance than fluoride,and dopes Nd^(3+)and Er^(3+) to make up for the shortcomings with the advantage of large cross-section for absorption.Under the excitation of 808 nm laser,this study is expected to design a green light-emitting material with better luminescence performance.Finally,the experimental results show that NaGd((WO_(4))_(2):5%Nd^(3+)/2%Er^(3+) is the best design combination,and the optimal power of the 808 nm laser is 283 mW.