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Energy transfer properties of a single-phase Na3Gd(PO4)2:Eu2+,Mn2+ phosphor with excellent thermal stability for w-LEDs.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 9/28/2022, Vol. 51 Issue 36, p13910-13918, 9p
- Publication Year :
- 2022
-
Abstract
- A high temperature solid state method was used to prepare Na<subscript>3</subscript>Gd(PO<subscript>4</subscript>)<subscript>2</subscript>:Eu<superscript>2+</superscript>,Mn<superscript>2+</superscript> phosphors with good thermal stability. The phosphor shows a broadband excitation region of 250–430 nm, which can be matched with the emissions of ultraviolet (UV)/near-ultraviolet (NUV) LED chips for white light emitting diodes (w-LEDs). The energy transfer efficiency is 74.46% from the sensitizer Eu<superscript>2+</superscript> ions to the activator Mn<superscript>2+</superscript> ions, which enhances the intensities of the Na<subscript>3</subscript>Gd(PO<subscript>4</subscript>)<subscript>2</subscript>-based phosphor. In addition, by increasing the Mn<superscript>2+</superscript> doping level in the phosphor, the Na<subscript>3</subscript>Gd(PO<subscript>4</subscript>)<subscript>2</subscript>:Eu<superscript>2+</superscript>,Mn<superscript>2+</superscript> phosphor first shows blue light, then turns to white light, and finally emits red light under 365 nm excitation. Besides, the temperature-dependent photoluminescence measurements indicate that the prepared phosphors exhibit good thermal stability. W-LEDs fabricated by combining a 365 nm chip with the Na<subscript>3</subscript>Gd(PO<subscript>4</subscript>)<subscript>2</subscript>:Eu<superscript>2+</superscript>,Mn<superscript>2+</superscript> phosphor exhibit bright white light, which has a high color rendering index (CRI) = 91.5, and a relatively low correlated color temperature (CCT) = 5198 K. Moreover, the CIE point is calculated to be at (0.3337, 0.3465), which is located in the white light region. These results indicate that the as-prepared phosphors can be considered as potential candidates for UV/NUV light-excited w-LED applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 51
- Issue :
- 36
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 159220191
- Full Text :
- https://doi.org/10.1039/d2dt01439d