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A novel Mn4+ doped oxyfluoride red phosphor for rapid-response backlights display.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 8/28/2020, Vol. 49 Issue 32, p11290-11299, 10p
- Publication Year :
- 2020
-
Abstract
- An oxyfluoride red phosphor Cs<subscript>2</subscript>MoO<subscript>2</subscript>F<subscript>4</subscript>:Mn<superscript>4+</superscript> was synthesized via a facile co-precipitation route with a certain molecular ratio of CsF and MoO<subscript>3</subscript>. X-ray diffraction analysis and its Rietveld refinement reveal that Cs<subscript>2</subscript>MoO<subscript>2</subscript>F<subscript>4</subscript>:Mn<superscript>4+</superscript> crystallized in an orthorhombic structure with the Amam (63) space group. Upon blue light excitation, Cs<subscript>2</subscript>MoO<subscript>2</subscript>F<subscript>4</subscript>:Mn<superscript>4+</superscript> exhibits a series of sharp red emission lines around ∼634 nm and the zero-phonon line (ZPL) is visible at 619 nm. The optimal doping amount of Mn<superscript>4+</superscript> in Cs<subscript>2</subscript>MoO<subscript>2</subscript>F<subscript>4</subscript> is 1.12%, and the decay curves show a good fit with the single exponential decay model. The fluorescence lifetime of the synthesized phosphors is relatively short and calculated as 3.18 to 2.46 ms, the Mn<superscript>4+</superscript> ions in Cs<subscript>2</subscript>MoO<subscript>2</subscript>F<subscript>4</subscript> experience a strong crystal field strength with a Dq/B of ∼4.87, and the distinct nephelauxetic ratio β<subscript>1</subscript> is determined to be ∼1.0226. The thermal quenching mechanism of Mn<superscript>4+</superscript> was also studied. Furthermore, by using the as-synthesized Cs<subscript>2</subscript>MoO<subscript>2</subscript>F<subscript>4</subscript>:Mn<superscript>4+</superscript> phosphor as a red component and β-SiALON as a green light component, a WLED was fabricated with a high luminous efficacy of 114.70 lm·W<superscript>−1</superscript> and wide color gamut of 109.1% of the National Television Standard Committee (NTSC) value. Hence, the Cs<subscript>2</subscript>MoO<subscript>2</subscript>F<subscript>4</subscript>:Mn<superscript>4+</superscript> phosphor with a short fluorescence lifetime could potentially be an efficient red compensator for application in rapid-response backlight displays. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 49
- Issue :
- 32
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 145187755
- Full Text :
- https://doi.org/10.1039/d0dt02093a