可控结晶法优化一种自还原体系新型红色荧光粉的热稳定性

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Controllable Crystallization Optimizes Thermal Stability of A Novel Red-emitting Phosphor in Self-reduction System

Abstract：Thermalquenching（TQ）atelevated temperature isamajorfactorafecting theluminescent intensityand eficiencyof phosphors.Improving the thermal stabilityofphosphorsand weakening theTQeffectareofsignificance for the high-quality illumination of phosphor-converted WLEDs.Here，a novel red-emiting phosphor （20 issynthesized bystandard high temperaturesolid statereaction inambient atmosphere，whichisanew memberof self-reduction system.Anefective synthesis strategy is proposed tooptimize its photoluminescent performances. Combined with X-ray photoelectron spectroscopy and X-ray absorption fine structure spectroscopy，oxygen vacancy defects introducedby Mn doping are proved to play an important rolein the transition of . Thermoluminescenceanalysis revealsthatthedistributionoftraplevels，especiallythedeepones，is effectivelyregulated bythecontrollablecrystalizationandsignificantlyaffctthethermalstabilityofphosphors.Thenadefect-assistedmodelis proposed toaddress the inner mechanism of the phenomenon.The carriers trapped bydeep trap levelscan be released underthehigh-temperaturestimulus，which returnbacktotheluminescentcenters and participate intheradiative recombination toimprovethermal stability.Thisstudyprovidesanew crystalographicideaandtheoreticalsupportfor obtaining luminescent materialswith high thermal stability.

KeyWords：photoluminescence；lattice defects；self-reduction;thermal stability CLC number：O482.31 Document code：A DOI：10.37188/CJL.20240212 CSTR：32170.14.CJL.20240212

鹿诗为"，董瑞'，白宇星'，杜海红¹，郑黎荣²，武莉1*，孔勇发¹，许京军1（1.南开大学物理科学学院，弱光非线性光子学教育部重点实验室，天津300071；2.中国科学院高能物理研究所北京同步辐射装置，北京100049）

摘要：高温下热猝灭（TQ）是影响荧光粉发光强度与发光效率的主要因素。（剩余28304字）