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Waterproof Alkyl Phosphate Coated Fluoride Phosphors for Optoelectronic Materials
Author(s) -
Nguyen HoangDuy,
Lin Chun Che,
Liu RuShi
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201504791
Subject(s) - phosphor , alkyl , materials science , coating , fluoride , phosphate , precipitation , nuclear chemistry , chemical engineering , chemistry , inorganic chemistry , optoelectronics , nanotechnology , organic chemistry , meteorology , physics , engineering
A facile approach for coating red fluoride phosphors with a moisture‐resistant alkyl phosphate layer with a thickness of 50–100 nm is reported. K 2 SiF 6 :Mn 4+ particles were prepared by co‐precipitation and then coated by esterification of P 2 O 5 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 °C) conditions for one month. Warm white‐light‐emitting diodes that consisted of blue InGaN chips, the prepared K 2 SiF 6 :Mn 4+ phosphors, and either yellow Y 3 Al 5 O 12 :Ce 3+ phosphors or green β‐SiAlON: Eu 2+ phosphors showed excellent color rendition.