蓝光激发的KMgF_(3)∶Cr^(3+)/Ni^(2+)基透明微晶玻璃超宽带近红外发光  

Blue Light-excitable Ultra-broadband Near-infrared Emission of KMgF_(3)∶Cr^(3+)/Ni^(2+)Nanocrystals Embedded in Glass Ceramics

作　　者：赖俊欢 陈龙 刘雪云 LAI Junhuan;CHEN Long;LIU Xueyun(The Research Institute of Advanced Technology,Ningbo University,Ningbo 315211,China;Ningbo Institute of Oceanography,Ningbo 315832,China)

机构地区：[1]宁波大学高等技术研究院,浙江宁波315211 [2]宁波海洋研究院,浙江宁波315832

出　　处：《发光学报》2024年第7期1134-1144,共11页Chinese Journal of Luminescence

基　　金：浙江省教育厅一般科研项目(Y202352183);浙江省省属高校基本科研业务费专项资助(2015054)。

摘　　要：近红外光谱技术在食品科学、信息安全、生物医疗等重大国计民生领域的应用对近红外光源提出了越来越高的要求。研发具有高效超宽带发射的近红外光源因此成为一项重要且迫切的研究课题。本文采用熔融淬火法在氟硅酸盐玻璃体系SiO_(2)-K_(2)CO_(3)-KF·2H_(2)O-MgF_(2)中成功析出了钙钛矿型KMgF_(3)纳米晶体。通过改变玻璃组分和热处理温度可以调控氟化物纳米晶相的析出,得到析晶和透明度最佳的微晶玻璃样品。玻璃中KMgF_(3)纳米晶体为Cr^(3+)和Ni^(2+)提供了稳定的八面体配位和低声子能量发光环境,在450 nm蓝光激发下,基于Cr^(3+)到Ni^(2+)的能量传递实现了Cr^(3+)(700~1200 nm)和Ni^(2+)(1400~1700 nm)双宽带近红外发射,并且双宽带近红外发光强度随离子掺杂浓度而可调变化。荧光光谱和荧光衰减曲线表征证明了Cr^(3+)到Ni^(2+)的能量传递过程,对应的能量传递效率为52.2%,能量传递机制为电子偶极-四极相互作用。研究结果不仅可以为系统掌握透明光学材料的超宽带发光规律提供基础数据,同时有助于设计开发低成本、高效率的近红外宽带光源。The growing interest of near-infrared(NIR)spectroscopy in food science,information security,and bio⁃medicine and other important national economy and people’s livelihood fields,has put forward higher demand for NIR light source.It is consequently becoming an important and urgent task to develop near-infrared light sources with highly efficient ultra-broadband emission.In this paper,perovskite KMgF_(3) nanocrystals were successfully pre⁃cipitated from a fluosilicate glass matrix SiO_(2)-K_(2)CO_(3)-KF·2H_(2)O-MgF_(2) via a melt quenching technique.By varying content of SiO_(2),K_(2)CO_(3),and MgF_(2) and heat treatment temperature,the precipitation of KMgF_(3) nanocrystals can be controlled,and thus glass ceramics with optimized crystallization and transparency were obtained.The crystallized KMgF_(3) nanocrystals in the glasses provide a stable octahedral coordination and low phonon energy environment for Cr^(3+)and Ni^(2+).Under 450 nm blue light excitation,dual-broadband NIR emission originating from Cr^(3+)(700-1200 nm)and Ni^(2+)(1400-1700 nm)is achieved based on the energy transfer from Cr^(3+)to Ni^(2+).The relative intensity of the NIR-emitting bands varies with the concentration of doping ions.Energy transfer behavior from Cr^(3+)to Ni^(2+)is demon⁃strated according to the measured emission spectra and decay curves,showing a maximum energy transfer efficiency of 52. 2%. The energy transfer mechanism can be attributed to electron dipole-quadrupole interaction. The research results not only provide reference data for systematically understanding the regulation of ultra-broadband lumines⁃ cence of transparent optical materials, but also contribute to the exploration of cost-effective and efficient broadband NIR light source.

关 键 词：微晶玻璃 氟化物纳米晶体 宽带近红外发光 Cr^(3+)和Ni^(2+) 

分 类 号：O482.31[理学—固体物理]