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A Novel Red-Emitting Na 2 NbOF 5 :Mn 4+ Phosphor with Ultrahigh Color Purity for Warm White Lighting and Wide-Gamut Backlight Displays.
- Source :
- Materials (1996-1944); Sep2021, Vol. 14 Issue 18, p5317-5317, 1p
- Publication Year :
- 2021
-
Abstract
- In this work, a novel red-emitting oxyfluoride phosphor Na<subscript>2</subscript>NbOF<subscript>5</subscript>:Mn<superscript>4+</superscript> with an ultra-intense zero-phonon line (ZPL) was successfully synthesized by hydrothermal method. The phase composition and luminescent properties of Na<subscript>2</subscript>NbOF<subscript>5</subscript>:Mn<superscript>4+</superscript> were studied in detail. The photoluminescence excitation spectrum contains two intense excitation bands centered at 369 and 470 nm, which match well with commercial UV and blue light-emitting diode (LED) chips. When excited by 470 nm blue light, Na<subscript>2</subscript>NbOF<subscript>5</subscript>:Mn<superscript>4+</superscript> exhibits red light emission dominated by ZPL. Notably, the color purity of the Na<subscript>2</subscript>NbOF<subscript>5</subscript>:Mn<superscript>4+</superscript> red phosphor can reach 99.9%. Meanwhile, the Na<subscript>2</subscript>NbOF<subscript>5</subscript>:Mn<superscript>4+</superscript> phosphor has a shorter fluorescence decay time than commercial K<subscript>2</subscript>SiF<subscript>6</subscript>:Mn<superscript>4+</superscript>, which is conducive to fast switching of images in display applications. Profiting from the intense ZPL, white light-emitting diode (WLED) with high color rendering index of Ra = 86.2 and low correlated color temperature of T<subscript>c</subscript> = 3133 K is realized using yellow YAG:Ce<superscript>3+</superscript> and red Na<subscript>2</subscript>NbOF<subscript>5</subscript>:Mn<superscript>4+</superscript> phosphor. The WLED fabricated using CsPbBr<subscript>3</subscript> quantum dots (QDs) and red Na<subscript>2</subscript>NbOF<subscript>5</subscript>:Mn<superscript>4+</superscript> phosphor shows a wide color gamut of 127.56% NTSC (National Television Standard Committee). The results show that red-emitting Na<subscript>2</subscript>NbOF<subscript>5</subscript>:Mn<superscript>4+</superscript> phosphor has potential application prospects in WLED lighting and display backlight. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19961944
- Volume :
- 14
- Issue :
- 18
- Database :
- Complementary Index
- Journal :
- Materials (1996-1944)
- Publication Type :
- Academic Journal
- Accession number :
- 152656608
- Full Text :
- https://doi.org/10.3390/ma14185317