Source abstract
Abstract
Abstract K 2 TiF 6 :Mn 4+ is an attractive narrow‐band red‐emitting phosphor for warm white light‐emitting diodes (LEDs). Nevertheless, the hexafluoride phosphor is liable to deliquesce in moist environments, which leads to a sharp deterioration performance of luminescence. Surface modification of K 2 TiF 6 :Mn 4+ phosphor with SrF 2 coating has been introduced, with the aid of KHF 2 transition layer to moderate the lattice mismatch. The reaction mechanism is discussed in detail, as so as the influence of SrF 2 coating on the luminescence intensity. The SrF 2 coating is able to prevent the hydrolysis of internal [MnF 6 ] 2− group; thereby, the luminescence intensity retains over 90% of initial value after being immersed in distilled water for 2 h. The LED devices fabricated with commercial Y 3 Al 5 O 12 :Ce 3+ and as‐modified K 2 TiF 6 :Mn 4+ phosphors exhibit bright white light with tunable chromaticity coordinate, correlated color temperature, and color rendering index. It enlightens a convenient method to enhance the moisture resistance of Mn 4+ doped fluoride phosphors for commercial application in the field of white LEDs.
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Research context
OpenAlex topics: Luminescence Properties of Advanced Materials · Inorganic Fluorides and Related Compounds · Radiation Detection and Scintillator Technologies
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Affiliations
Ministry‐Province Jointly‐Constructed Cultivation Base for State Key Laboratory of Processing for Nonferrous Metal and Featured Materials Guangxi Key Laboratory of Optical and Electronic Materials and Devices College of Materials Science and Engineering Guilin University of Technology Guilin China
Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi Guilin University of Technology Guilin China
Funding
National Natural Science Foundation of China · Natural Science Foundation of Guangxi Province
References (30)
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