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Novel Mn 4+ -Activated K 2 Nb 1− x Mo x F 7 (0 ≤ x ≤ 0.15) Solid Solution Red Phosphors with Superior Moisture Resistance and Good Thermal Stability.
- Source :
- Molecules; Jun2023, Vol. 28 Issue 11, p4566, 16p
- Publication Year :
- 2023
-
Abstract
- Nowadays, Mn<superscript>4+</superscript>-activated fluoride red phosphors with excellent luminescence properties have triggered tremendous attentions for enhancing the performance of white light-emitting diodes (WLEDs). Nonetheless, the poor moisture resistance of these phosphors impedes their commercialization. Herein, we proposed the dual strategies of "solid solution design" and "charge compensation" to design K<subscript>2</subscript>Nb<subscript>1−x</subscript>Mo<subscript>x</subscript>F<subscript>7</subscript> novel fluoride solid solution system, and synthesized the Mn<superscript>4+</superscript>-activated K<subscript>2</subscript>Nb<subscript>1−x</subscript>Mo<subscript>x</subscript>F<subscript>7</subscript> (0 ≤ x ≤ 0.15, x represents the mol % of Mo<superscript>6+</superscript> in the initial solution) red phosphors via co-precipitation method. The doping of Mo<superscript>6+</superscript> not only significantly improve the moisture resistance of the K<subscript>2</subscript>NbF<subscript>7</subscript>: Mn<superscript>4+</superscript> phosphor without any passivation and surface coating, but also effectively enhance the luminescence properties and thermal stability. In particular, the obtained K<subscript>2</subscript>Nb<subscript>1−x</subscript>Mo<subscript>x</subscript>F<subscript>7</subscript>: Mn<superscript>4+</superscript> (x = 0.05) phosphor possesses the quantum yield of 47.22% and retains 69.95% of its initial emission intensity at 353 K. Notably, the normalized intensity of the red emission peak (627 nm) for the K<subscript>2</subscript>Nb<subscript>1−x</subscript>Mo<subscript>x</subscript>F<subscript>7</subscript>: Mn<superscript>4+</superscript> (x = 0.05) phosphor is 86.37% of its initial intensity after immersion for 1440 min, prominently higher than that of the K<subscript>2</subscript>NbF<subscript>7</subscript>: Mn<superscript>4+</superscript> phosphor. Moreover, a high-performance WLED with high CRI of 88 and low CCT of 3979 K is fabricated by combining blue chip (InGaN), yellow phosphor (Y<subscript>3</subscript>Al<subscript>5</subscript>O<subscript>12</subscript>: Ce<superscript>3+</superscript>) and the K<subscript>2</subscript>Nb<subscript>1−x</subscript>Mo<subscript>x</subscript>F<subscript>7</subscript>: Mn<superscript>4+</superscript> (x = 0.05) red phosphor. Our findings convincingly demonstrate that the K<subscript>2</subscript>Nb<subscript>1−x</subscript>Mo<subscript>x</subscript>F<subscript>7</subscript>: Mn<superscript>4+</superscript> phosphors have a good practical application in WLEDs. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14203049
- Volume :
- 28
- Issue :
- 11
- Database :
- Complementary Index
- Journal :
- Molecules
- Publication Type :
- Academic Journal
- Accession number :
- 164216455
- Full Text :
- https://doi.org/10.3390/molecules28114566