Waterproof Alkyl Phosphate Coated Fluoride Phosphors for Optoelectronic Materials
Waterproof Alkyl Phosphate Coated Fluoride Phosphors for Optoelectronic Materials
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DOI：
10.1002/anie.201504791
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发表时间：
2015-09-07
影响因子：
16.6
通讯作者：
Liu, Ru-Shi
中科院分区：
文献类型：
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作者：
Hoang-Duy Nguyen;Lin, Chun Che;Liu, Ru-Shi
报道了一种用50 ~ 100nm厚度的耐湿烷基磷酸盐层包覆红色氟化物荧光粉的简便方法。采用共沉淀法制备了K2SiF6:Mn4+颗粒，并将P2O5与醇类（甲醇、乙醇和异丙醇）酯化反应包被。采用该方法，用过渡金属离子作为烷基磷酸基团之间的交联剂包封所制备的荧光粉。在高湿（85%）和高温（85℃）条件下老化一个月后，包覆的荧光粉颗粒表现出较高的耐水性，并保持了约87%的初始外部量子效率。由蓝色InGaN芯片、制备的K2SiF6:Mn4+荧光粉、黄色Y3Al5O12:Ce3+荧光粉或绿色-SiAlON: Eu2+荧光粉组成的暖白色发光二极管显示出优异的显色性。
A facile approach for coating red fluoride phosphors with a moisture-resistant alkyl phosphate layer with a thickness of 50-100nm is reported. K2SiF6:Mn4+ particles were prepared by co-precipitation and then coated by esterification of P2O5 with alcohols (methanol, ethanol, and isopropanol). This route was adopted to encapsulate the prepared phosphors using transition-metal ions as cross-linkers between the alkyl phosphate moieties. The coated phosphor particles exhibited a high water tolerance and retained approximately 87% of their initial external quantum efficiency after aging under high-humidity (85%) and high-temperature (85 degrees C) conditions for one month. Warm white-light-emitting diodes that consisted of blue InGaN chips, the prepared K2SiF6:Mn4+ phosphors, and either yellow Y3Al5O12:Ce3+ phosphors or green -SiAlON: Eu2+ phosphors showed excellent color rendition.