面向紫光激发白光LED用荧光材料的耐候性  

Stability of Phosphors for White LED Excitable by Violet Light

作　　者：潘泽晟 游雅萍 郑雅 陈海杰 王连军[1,2] 江莞[1,2] PAN Zesheng;YOU Yaping;ZHENG Ya;CHEN Haijie;WANG Lianjun;JIANG Wan(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China;Institute of Functional Materials,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学材料科学与工程学院,纤维材料改性国家重点实验室,上海201620 [2]东华大学功能材料研究中心,上海201620

出　　处：《无机材料学报》2025年第3期314-322,I0006-I0009,共13页Journal of Inorganic Materials

基　　金：国家重点研发项目(2021YFB3500504)。

摘　　要：紫光激发白光发光二极管(Light Emitting Diode,LED)具有色温可调、视觉友好等优点,已经受到了广泛关注。但是,适用于紫光(400~420 nm)激发的高性能荧光材料尚未取得大规模应用,其中荧光材料的耐候性是评判其是否具有商业化应用潜力的重要因素之一。然而,目前针对荧光材料耐候性的研究却十分缺乏。本研究首先采用固相反应法制备了K_(2)CaPO_(4)F:Eu^(2+)、K_(1.3)Al_(11)O_(17)+δ:Eu^(2+)和Ca_(2)YHf_(2)Al_(3)O_(12):Ce^(3+),Tb^(3+)三种LED用紫光激发稀土发光材料。然后开展了荧光粉在高温高湿、水浸泡、LED芯片紫光辐照等条件下的耐候性实验,研究了其耐候性以及失效机理。最后,将三种荧光粉与400 nm紫光芯片组合,制备了白光LED器件。结果表明,相较于同体系荧光粉,本研究所制备的荧光粉不仅在发光性能方面有所优化,而且对材料在不同使用环境下的耐候性表征更为全面。所制备的白光LED器件的显色指数为93.6、色温为5151 K、色坐标为(0.34,0.36),展现出优质的白光照明性能,且白光LED器件的耐候性相对于单一荧光粉有所提升。上述研究表明,对荧光材料及其对应的LED器件进行耐候性评估是至关重要的。本工作率先开展了紫光激发LED用荧光材料的耐候性研究,对于推动其应用具有指导和借鉴意义。Violet light excited white light emitting diodes(LEDs)have attracted widespread attention due to their advantages of tunable color temperature and visual comfort.However,high-performance phosphors suitable for violet light excitation(400–420 nm)have not yet been widely applied on a large scale.One of the key factors regarding the commercial utilizations is the stability.Unfortunately,there still lacks research on this issue.In this study,three rare-earth phosphors suitable for violet light excitation in LEDs were synthesized via a solid-state reaction method,namely K_(2)CaPO_(4)F:Eu^(2+)、K_(1.3)Al_(11)O_(17)+δ:Eu^(2+)andCa_(2)YHf_(2)Al_(3)O_(12):Ce^(3+),Tb^(3+).The stability experiments were then conducted under conditions of high temperature and humidity,water immersion,and long-term violet light irradiation from LED chips.The luminescent properties,failure mechanisms,and environmental stability were analyzed.Finally,a white LED device was prepared by combining the as-synthesized three phosphors onto a 400 nm violet light chip.Results demonstrate that the as-synthesized phosphors exhibit not only optimized luminescence performance compared to phosphors prepared in former works,but also a more comprehensive evaluation of environmental stability across different conditions.The white LED device achieves a color rendering index of 93.6,a correlated color temperature of 5151 K and a color coordinate of(0.34,0.36),showcasing excellent white light illumination performance.Furthermore,the environmental stability of the white LED device is improved compared to individual phosphors.By taking lead in investigating the environmental stability of violet light excited LED phosphors,this work provides valuable insights and guidance for advancing their applications.

关 键 词：耐候性 稀土发光材料 白光LED 紫光激发 

分 类 号：O482[理学—固体物理]