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Comparative analysis on the photoluminescence properties of Cs 2 BF 6 :Mn 4+ (B = Ge, Si, Zr, Ti) red phosphors for WLEDs
Author(s) -
Liu Manman,
Dang Peipei,
Wei Yi,
Liang Sisi,
Liu Guofeng,
Geng Aifang,
Lian Hongzhou,
Lin Jun
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16806
Subject(s) - phosphor , photoluminescence , analytical chemistry (journal) , materials science , scanning electron microscope , luminescence , color temperature , emission spectrum , quantum efficiency , chemistry , spectral line , optoelectronics , physics , astronomy , composite material , chromatography
A series of Cs 2 BF 6 :Mn 4+ (B = Ge, Si, Ti, Zr) red phosphors were synthesized by a precipitation‐cation exchange route. The phase purity, morphology, and constituent were characterized by X‐ray diffraction (XRD) and scanning electron microscopy (SEM). Optical properties were investigated by photoluminescence (PL) spectra and high‐resolution PL. Temperature‐dependent PL examination at the range of both 273‐573 K and 10‐300 K was performed to investigate the emission mechanism of Mn 4+ in these fluorides. The intensity for both zero‐phonon lines (ZPLs) and vibration coupled emission of Mn 4+ in these four systems with different crystal structures was investigated systematically. These phosphors present bright red emission under blue light (467 nm) illumination, among which Cs 2 GeF 6 :0.1Mn 4+ shows the highest emission intensity with ultrahigh quantum efficiency of 94%. The white light‐emitting diodes (WLEDs) fabricated with this sample, blue InGaN chips and commercial YAG:Ce 3+ phosphor exhibited high luminous efficacy beyond 100 lm/w with high color rendering index (~88.6) and low color temperature (~3684 K).