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Improving Moisture Resistance of K2SiF6∶Mn4+
增强出版via Passivation Effect of Lactobionic Acid- Chinese Journal of Luminescence Vol. 43, Issue 8, Pages: 1300-1308(2022)
- 作者机构：
1.湖南师范大学 化学化工学院， 湖南 长沙 410081
2.湖南普斯赛特光电科技有限公司， 湖南 长沙 410116
- 作者简介：
- 基金信息：Natural Science Foundation of Changsha(kq2202235);The Opening Fund of Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research（Hunan Normal University）, Ministry of Education（KLCBTCMR20‐23）
DOI：10.37188/CJL.20220127
CLC：
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WAN Ping-ping, YANG Jing, LIU Hong-xiu, et al. Improving Moisture Resistance of K2SiF6∶Mn4+
via Passivation Effect of Lactobionic Acid. [J]. Chinese Journal of Luminescence 43(8):1300-1308(2022)WAN Ping-ping, YANG Jing, LIU Hong-xiu, et al. Improving Moisture Resistance of K2SiF6∶Mn4+
via Passivation Effect of Lactobionic Acid. [J]. Chinese Journal of Luminescence 43(8):1300-1308(2022) DOI： 10.37188/CJL.20220127.
摘要
耐湿性差是掺Mn,4+,氟化物红色荧光粉在高稳定性器件应用中面临的一个瓶颈问题。本工作提出利用乳糖酸的钝化效应清除K,2,SiF,6,∶Mn,4+,表面的Mn,4+,，重构无Mn,4+,的氟化物惰性壳层，以提升其耐湿性。结果表明，经乳糖酸钝化后的氟化物的晶相、形貌及发光强度几乎不变。水浸360 h后，钝化的氟化物的内量子效率为96.9%，远高于未处理的氟化物的59.8%。经乳糖酸处理，水解后的氟化物的内量子产率可以恢复到98.8%。在60 mA驱动电流下，将钝化后的氟化物作为红光成分，封装了相关色温为3 518 K、显色指数为88.5、发光效率为130.61 lm·W,-1,的暖白光LED。在高温（85,℃）高湿（85%）环境中老化500 h后，该LED器件具有较高稳定性，光效可维持为初始值的90.5%，高于未经处理的氟化物所封装的白光器件（82.3%）。因此，简单的乳糖酸处理可以有效提升掺Mn,4+,氟化物的耐湿性。本工作可为高稳定性氟化物红色荧光粉的工业化生产提供借鉴。
Abstract
Poor moisture resistance is a bottleneck for the application of Mn,4+,-doped fluoride red phosphors in high-stability devices. This work proposes to use the passivation effect of lactobionic acid to remove Mn,4+, on the surface of K,2,SiF,6,∶Mn,4+,， and reconstruct the Mn,4+,-free fluoride inert shell to improve its moisture resistance. The results show that the crystal phase， morphology and luminescence intensity of the passivated fluoride are almost unchanged. After 360 h of water immersion， the internal quantum efficiency of the passivated fluoride is 96.9%， which is much higher than that（59.8%） of the untreated fluoride. After treatment with lactobionic acid， the internal quantum yield of hydrolyzed fluoride can be recovered to 98.8%. At a driving current of 60 mA， a warm white LED with a correlated color temperature of 3 518 K， a color rendering index of 88.5， and a luminous efficiency of 130.61 lm·W,-1, was encapsulated by using the passivated fluoride as the red-light component. After aging in a high temperature（85 ℃） and high humidity（85%） environment for 500 h， the LED device has high stability， and the luminous efficiency can maintain at 90.5% of the initial value， which is higher than that（82.3%） of white LED encapsulated with the untreated fluoride. Therefore， the simple lactobionic acid treatment can effectively improve the moisture resistance of Mn,4+,-doped fluorides. This work can provide a reference for the industrial production of highly stable fluoride red phosphors.
关键词
K2SiF6∶Mn4+耐湿性惰性壳层白光LED乳糖酸
Keywords
K2SiF6∶Mn4+moisture resistanceinert shellwhite LEDlactobionic acid
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