Back to Search
Start Over
A novel Cs2NbOF5:Mn4+ oxyfluoride red phosphor for light-emitting diode devices.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 12/7/2018, Vol. 47 Issue 45, p16048-16056, 9p
- Publication Year :
- 2018
-
Abstract
- The addition of a red-emitting phosphor to YAG:Ce<superscript>3+</superscript>-based white light-emitting diodes (WLEDs) greatly facilitates their applications in the field of high-color-rendering-index warm solid-state lighting. It is highly desirable to develop a red phosphor with satisfactory spectral features and low synthesis cost. In this study, a novel non-rare-earth and nonequivalent doping type of Cs<subscript>2</subscript>NbOF<subscript>5</subscript>:Mn<superscript>4+</superscript> oxyfluoride red-emitting phosphor with high luminous efficiency was obtained via a facile room-temperature co-precipitation method, and its morphology and luminescent properties were investigated in detail. The Cs<subscript>2</subscript>NbOF<subscript>5</subscript>:Mn<superscript>4+</superscript> phosphor with micro-rod-like morphology exhibited broad band absorption at blue light region (∼474 nm) and narrow bandwidth emissions at red region (∼633 nm). The color purity of the Cs<subscript>2</subscript>NbOF<subscript>5</subscript>:Mn<superscript>4+</superscript> phosphor was calculated to be about 99%, and the internal quantum yield (QY) under 474 nm excitation was 63.4%. The concentration quenching of Mn<superscript>4+</superscript> in Cs<subscript>2</subscript>NbOF<subscript>5</subscript> matrix was mainly due to dipole–dipole interactions, and the activation energy of temperature quenching was calculated to be ∼0.2610 eV. The demonstration of a blue InGaN LED chip in combination with a blend of newly developed Cs<subscript>2</subscript>NbOF<subscript>5</subscript>:Mn<superscript>4+</superscript> red phosphor and YAG:Ce<superscript>3+</superscript> yellow phosphor greatly decreased the correlated color temperature (CCT) from 6255 to 3517 K while significantly improving the color rendering index (CRI) from 72.5 to 87.5. It deserves to be mentioned that the brand-new matrix to phosphor in the present study can be extended to various niobium/tantalum oxyfluoride series, which is very helpful for developing and designing new red phosphors. [ABSTRACT FROM AUTHOR]
- Subjects :
- OXYFLUORIDES
LIGHT emitting diodes
PHOSPHORS
Subjects
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 47
- Issue :
- 45
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 133148917
- Full Text :
- https://doi.org/10.1039/c8dt02817f