Crystal-Site Engineering of Novel Na3KMg7(PO4)6-x(BO3)x:Eu2+ Phosphors for Full-Spectrum Lighting.
Inorg Chem
; 63(17): 7984-7991, 2024 Apr 29.
Article
em En
| MEDLINE
| ID: mdl-38622961
ABSTRACT
The "cyan gap" is the bottleneck problem in violet-driven full-spectrum white-light-emitting diodes (wLEDs) in healthy lighting. Accordingly, we develop a novel broadband-blue-cyan emission Na3KMg7(PO4)6-x(BO3)xEu2+ (NKMPBEu2+) phosphor via crystal-site engineering. This phosphor is derived from the Na3KMg7(PO4)6Eu2+ phosphor, which shows desired abundant cyan emissive components. A comparative study is conducted to reveal the microstructure-property relationship and the key influential factors to its spectrum distribution. It can be found that the introduced (BO3)3- units can manipulate the site-selective occupation of Eu2+ activators, asymmetrically broadening the emission spectrum in NKMPBEu2+. Considering detailed luminescence performance analysis and the density functional theory calculations, a new substitution pathway of Eu2+ is created by substituting (PO4)3- with (BO3)3- units, making partial Eu2+ ions enter the Mg2+ (CN = 5, CN = 6) crystallographic sites, and yielding an extra emission band at 600 nm (16667 cm-1) and especially 501 nm (19960 cm-1). Meanwhile, a high-color-quality full-spectrum-emitting wLEDs was fabricated, upon 100 mA forward-bias current driven. Due to the achieved extra cyan emissive components of NKMPBEu2+, the constructed NKMPBEu2+-based wLEDs show better color rendering ability (â¼90.9) than that of Na3KMg7(PO4)6Eu2+-based wLEDs (â¼86.3), and also demonstrate its great potential in full-spectrum healthy lighting.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Inorg Chem
Ano de publicação:
2024
Tipo de documento:
Article
País de publicação:
Estados Unidos