CaCO_(3):Eu^(3+)@K_(2)CO_(3)红光荧光粉的合成及其发光的负热猝灭效应

Synthesis of CaCO_(3):Eu^(3+)@K_(2)CO_(3) Red Emitting Phosphors and their Luminescent Negative Thermal Quenching Effect

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摘要目前,已发现有部分Eu^(3+)掺杂的荧光粉因负热猝灭效应的出现而具有较高的发光热稳定性。为了获得具有较高发光热稳定性的Eu^(3+)掺杂CaCO_(3)红光荧光粉,本文将共沉淀法与简单包覆法结合,合成了一系列的CaCO_(3):Eu^(3+)@K_(2)CO_(3)红光荧光粉。实验结果表明,未包覆样品和包覆样品会产生不同的发光热效应,前者呈现正常的热猝灭效应,后者则表现出负的热猝灭效应。在负热猝灭效应的支撑下,最佳包覆样品具有很高的荧光热稳定性,该样品在190℃和265℃时的积分发光强度,分别为30℃初始值的149.98%和100%。良好的热稳定性表明,该样品在紫外激发三基色白光LEDs中有广阔的应用前景。基于实验结果并在文献报道的支撑下,笔者对负热猝灭效应进行了机理探讨,指出负热猝灭效应的机理是一种热能被转换为光能的机理。 At present,some Eu3+-doped phosphors had been found to have high luminescence and thermal stability due to the negative thermal quenching effect.In order to obtain high luminescent thermal stability of Eu^(3+)-doped CaCO_(3) red emitting phosphors,a series of red emitting phosphors contained CaCO_(3):Eu^(3+)@K_(2)CO_(3) were synthesized by combination of coprecipitation method and simple coating method.The experimental results showed that the uncoated and coated samples had different luminescent thermal effects,the former showed normal thermal quenching effect,the latter showed negative thermal quenching effect.Under the support of negative thermal quenching effect,the optimal coated sample had high luminescent thermal stability.The integrated luminescent intensity of the coated sample at 190℃ and 265℃ was 149.98% and 100% of the initial value at 30℃.Based on the experimental results,the mechanism of negative thermal quenching effect was discussed,and it was pointed out that the mechanism of negative thermal quenching effect was a mechanism of heat energy being transformed into light energy.The good thermal stability indicated that the sample had a broad application prospect in UV-excited white LEDs.

作者邬智高李燕凌绍堃王亚雄黄映恒廖森 WU Zhigao;LI Yan;LING Shaokun;WANG Yaxiong;HUANG Yingheng;LIAO Sen(School of Medicine and Health,Guangxi Vocational&Tecnnical Institute of Industry,Nanning 530003,China;School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China;Guangxi Jingzheng Technology Development Co.,Ltd.,Nanning 530007,China)

机构地区广西工业职业技术学院医药与健康学院广西大学资源环境与材料学院广西大学化学化工学院广西经正科技开发有限责任公司

出处《化工技术与开发》 CAS 2021年第9期1-6,共6页 Technology & Development of Chemical Industry

基金国家自然科学基金项目(No.21661006,No.21965004)。

关键词红光荧光粉简单包覆法合成负热猝灭效应能量转换稀土发光材料 red emitting phosphor simple coating synthesis negative thermal quenching effect energy conversion rare earth luminescent material

分类号 O482.31 [理学—固体物理]