发光学报2025，Vol.46Issue(9)：1639-1648,10.DOI:10.37188/CJL.20250102
惰性壳层介电效应对核壳结构上转换纳米晶发光性能的影响
Influence of Inert Shell Dielectric Effect on Luminescent Properties of Core-shell Upconversion Nanocrystals
摘要
Abstract
A series of core/shell upconversion nanocrystals(UCNCs)featuring β-NaYF4∶Yb3+/A3+(A=Er,Ho,Tm)cores and distinct inert shells(NaLuF4,NaYF4,NaGdF4)were synthesized through the co-precipitation method combined with a successive layer-by-layer strategy.The influence of shell composition on luminescent properties was investigated and the un-derlying mechanism was analyzed through upconversion emission spectrum and luminescent lifetime measurements.Experi-mental results indicate that both the upconversion luminescence intensity and the Yb3+luminescent lifetime of core/shell UCNCs depends on the composition of inert shell,exhibiting a gradual decrease in the order of NaLuF4>NaYF4>NaGdF4.This trend suggests progressively reduced capabilities of three kinds of inert shell in suppressing surface quenching.The influ-ences of three kinds of inert shell become more pronounced in aqueous environments with high quenching probabilities.Theo-retical calculations reveal that the variation in dielectric constant among the inert shell materials may play a critical role,with NaLuF4 showing the lowest relative dielectric constant.The shell layer with low dielectric constant can mitigate the electric di-pole interaction between Yb3+ions in the core and surface-adsorbed ligands,thereby suppressing non-radiative energy losses.This study reveals the possible regulatory mechanism of the dielectric effect of inert shell on the surface quenching effect,pro-viding valuable guidance for the compositional design of high-brightness core/shell UCNCs.关键词
核壳结构纳米晶/上转换发光/惰性壳层/介电常数Key words
core-shell nanocrystal/upconversion luminescence/inert shell/dielectric constant分类
数理科学引用本文复制引用
王进,于世杰,胡焱清,邵起越..惰性壳层介电效应对核壳结构上转换纳米晶发光性能的影响[J].发光学报,2025,46(9):1639-1648,10.基金项目
江苏省科技成果转换计划(BA2020007)Supported by the Transformation Program of Scientific and Technological Achievements of Jiangsu Province(BA2020007) （BA2020007）
