Modulating luminescence of K_(3)AlF_(6):Mn^(4+)NCs via charge compensation and localized surface plasmon resonance effect  

通过电荷补偿和局域表面等离子体共振效应调制K3AlF6:Mn4+纳米晶体的发光性质

作　　者：Chen Yang Yuhuan Tan Zheyi Li Shan Liang Xi-Hua Guan Zhong-Jian Yang Shixun Lian Wenli Zhou 杨晨;谭宇桓;李喆意;梁珊;官习华;杨中见;廉世勋;周文理

机构地区：[1]Key Laboratory of Light Energy Conversion Materials of Hunan Province College,Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research(Ministry of Education),College of Chemistry and Chemical Engineering,Hunan Normal University,Changsha,410081,China [2]Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education,Department of Physics,Hunan Normal University,Changsha,410081,China [3]Hunan Key Laboratory of Nanophotonics and Devices,School of Physics,Central South University,Changsha,410083,China

出　　处：《Science China Materials》2025年第4期1047-1056,共10页中国科学(材料科学)(英文版)

基　　金：financially supported by the National Key R&D Program of China(2023YFD1700903);the Changsha Natural Science Foundation(kq2202235);supported by the Hunan Normal University Student Innovation and Entrepreneurship Training Programme(S202410542088,2024221)for Zheyi Li。

摘　　要：The reduction in photoluminescence efficiency due to crystallite downsizing is a significant issue in Mn4+-doped fluoride nanomaterials,crucial for their application in full-color micro-LED displays.This study presents a strategy to enhance the photoluminescence efficiency of K_(3)AlF_(6):Mn4+nanocrystals(NCs)by incorporating Mg^(2+)for charge compensation and utilizing the plasmonic effect of Au nanorods.We found that Mg^(2+)incorporation effectively reduced lattice defects,increasing photoluminescence intensity by 17%and internal quantum efficiency from 22.37%to 27.56%.Fabricating Au@SiO_(2)/fluoride nanocomposites,we investigated how the SiO_(2) spacer layer thickness,Au@SiO_(2) resonance wavelength,and relative concentration affect photoluminescence properties.Optimizing the balance between Purcell and Förster resonance energy transfer effects further increased photoluminescence intensity by 25%,internal quantum efficiency to 32.09%,and external quantum efficiency from 14.20%to 18.05%.Additionally,we assessed the potential application of these nanocomposites in micro-LED display technology by examining nanocomposite-PMMA films.This work provides insights into the development of highly efficient red-emitting nanomaterials.晶体尺寸减小导致发光效率降低是Mn4+掺杂氟化物纳米材料面临的一个瓶颈问题,这对于它们在全彩micro-LED显示技术中的应用至关重要.本研究提出了一种协同策略,即通过引入Mg2+进行电荷补偿和利用金纳米棒的等离子体效应来增强K3AlF6:Mn4+纳米晶体的发光效率.我们发现,Mg2+的引入有效减少了晶格缺陷,使发光强度提高了17%,内量子效率从22.37%提高到27.56%.通过制备Au@SiO2/氟化物纳米复合材料,我们研究了SiO2间隔层厚度、Au@SiO2共振波长和相对浓度如何影响光致发光性能.通过平衡Purcell效应和F?rster共振能量转移效应,进一步使光致发光强度提高了25%,将内量子效率提高到32.09%,外量子效率从14.20%提高到18.05%.此外,通过制备和表征纳米复合材料-PMMA膜,我们评估了这些纳米复合材料在micro-LED显示技术中的潜在应用.这项工作为开发具高效的红色纳米发光材料提供了思路.

关 键 词：FLUORIDE Mn4+doping charge compensation localized surface plasmon resonance micro-LED 

分 类 号：O469[理学—凝聚态物理]