Control upconversion decay dynamics from perspective of collective response  

作　　者：Yingdong Han Yutong Pan Tong Wei Yu Ma Xingxing Zhang Lei Jiang Kai Chen Liwei Wu Jiao Cui Chao Gao 

机构地区：[1]College of Science,Civil Aviation University of China,Tianjin,300300,China [2]School of Inspection and Testing Certification,Changzhou Vocational Institute of Engineering,Changzhou,213164,China [3]School of Chemical and Physical Sciences,Victoria University of Wellington,Wellington,6012,New Zealand [4]Robinson Research Institute,Faculty of Engineering,Victoria University of Wellington,Wellington,6012,New Zealand

出　　处：《Journal of Rare Earths》2025年第1期57-63,I0003,共8页稀土学报(英文版)

基　　金：Project supported by the National Natural Science Foundation of China(62105235,62205035);the Scientific Research Project of Tianjin Education Commission(2022KJ060);Qinglan Project of Jiangsu Province of China;Natural Science Foundation of the Jiangsu Higher Education Institutions of China(22KJD350001)。

摘　　要：Very recently,upconversion luminescence(UCL)lifetime,as a powerful optical dimension,has attracted tremendous research interest due to its advantages of high information capacity and high photophysical stability.With the implementation and emergence of endlessly fascinating UCL features,it is particularly meaningful to understand the photophysical mechanisms inside UCL materials to enable rational subdivision-level structure design,which is however currently far from sufficient.In this work,we take an ordinary upconversion nanoparticle as an example to prove that the UCL decay curves and corresponding lifetimes are indeed a collective response of the entire UCL system to excitations,that exhibits correlated,yet quite different properties from individual ions.A specially developed theoretical random walk model combined with an experimental lifetime control for Yb^(3+)/Er^(3+)UCL demonstrates that ene rgy diffusion principally alters the decay rate.Moreover,the different extent of the influence of energy diffusion on the emissions of ^(2)H_(11/2)/^(4)S_(3/2)(green)and ^(4)F_(9/2)(red)leads to an extremely uncommon crossover comparison of decay rates.This work provides new ideas for understanding decay dynamics and practical UCL lifetime manipulation methods.

关 键 词：UPCONVERSION LIFETIME Collective response Decaycurves Random walk model Rare earths 

分 类 号：O57[理学—粒子物理与原子核物理]