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Full-visible-spectrum lighting realized by a novel Eu2+-doped cyan-emitting borosilicate phosphor.
- Source :
- CrystEngComm; 7/28//2020, Vol. 22 Issue 28, p4702-4709, 8p
- Publication Year :
- 2020
-
Abstract
- White light-emitting diodes (WLEDs) have become one of the first choices in the field of lighting due to their unique advantages. In the traditional system of near-ultraviolet (NUV) chips combined with blue/green/red-emitting phosphors, the partial absence of a blue-green cavity makes it difficult to achieve full-spectrum emission. Accordingly, cyan-emitting phosphors can effectively compensate for this missing part. Therefore, it is necessary and urgent to explore the cyan-emitting phosphor with excellent luminous performance. Herein, we have designed and prepared a novel cyan-emitting borosilicate phosphor Ba<subscript>3</subscript>Ca<subscript>4</subscript>(BO<subscript>3</subscript>)<subscript>3</subscript>(SiO<subscript>4</subscript>)Cl:xEu<superscript>2+</superscript> (BCBS:xEu<superscript>2+</superscript>). Its crystal structure was determined by powder X-ray diffraction and Rietveld methods. The BCBS:xEu<superscript>2+</superscript> phosphors have a wide excitation band covering the UV-NUV region and can emit a broad cyan light. The emission peaks at 488 nm have a large full width at half maximum (FWHM) of 118 nm, excited by 350 nm. There are three different Eu<superscript>2+</superscript> luminescence centers in BCBS:xEu<superscript>2+</superscript>, which are determined by analyzing the structure and decay curves. The optimal concentration was x = 0.04 and the quantum efficiency of the BCBS:0.04Eu<superscript>2+</superscript> sample was 31.2%. In addition, by combining BCBS:Eu<superscript>2+</superscript>, Sr<subscript>2</subscript>SiO<subscript>4</subscript>:Eu<superscript>2+</superscript> and (Ca,Sr)AlSiN<subscript>3</subscript>:Eu<superscript>2+</superscript> phosphors with a 395 nm NUV chip, a WLED lamp was obtained. The emitted white light can display excellent performances of CIE = (0.3655, 0.3641), CCT = 4337 K and CRI = 90.1. All the results demonstrate that the BCBS:Eu<superscript>2+</superscript> phosphors have potential applications in full-visible-spectrum lighting. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14668033
- Volume :
- 22
- Issue :
- 28
- Database :
- Complementary Index
- Journal :
- CrystEngComm
- Publication Type :
- Academic Journal
- Accession number :
- 144670192
- Full Text :
- https://doi.org/10.1039/d0ce00794c