科研之友
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摘要
Inorganic luminescent materials with narrow-band emission are widely used in light emitting diode (LED) for illumination and display devices, which can improve the color rendering index and luminous efficacy of illumination devices (such as narrow-band red phosphors), and can also increase the color gamut of liquid crystal display devices (such as narrow-band blue/green/red phosphors). So far, such new narrow-band inorganic luminescent materials host systems are very limited, and especially the research of Eu2+ doped new narrow-band phosphor remains a challenge, because Eu2+ and Ce3+ with 4f-5d transition usually exhibit the peak broadening effect due to the crystal field effects. In recent years, the research focused on the phosphors with the UCr4C4-related type structure have made great progress, and a series of narrow-band red-emitting nitride phosphors with potential application have been discovered. More recently, our research group has made breakthroughs in the research of Eu2+ doped narrow-band silicate phosphors with the UCr4C4-related type structure. Here in this review, the recent progress and application of Eu2+ doped narrow-band silicate phosphors with the UCr4C4-related type structure are reviewed. The structural evolution characteristics of nitrides and silicates with the UCr4C4-related type structure are pointed out, and the crystal structure characteristics, luminescence properties are summarized. Afterwards, the application of Eu2+ doped narrow-band silicate phosphors with the UCr4C4-related type structure are introduced, and the current challenges in tuning photoluminescence color and improving chemical stability and the meaningful attempts are pointed out. Finally, the future developments of Eu2+ doped narrow-band oxide phosphors with the UCr4C4-related type structure are prospected.
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