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Pressure‐Driven Eu 2+ ‐Doped BaLi 2 Al 2 Si 2 N 6 : A New Color Tunable Narrow‐Band Emission Phosphor for Spectroscopy and Pressure Sensor Applications
Author(s) -
Wang Yichao,
Seto Takatoshi,
Ishigaki Kento,
Uwatoko Yoshiya,
Xiao Guanjun,
Zou Bo,
Li Guangshe,
Tang Zuobin,
Li Zebin,
Wang Yuhua
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202001384
Subject(s) - phosphor , materials science , photoluminescence , gamut , luminescence , emission spectrum , rietveld refinement , hydrostatic pressure , doping , analytical chemistry (journal) , light emitting diode , diffraction , spectroscopy , optoelectronics , spectral line , optics , physics , chemistry , chromatography , astronomy , thermodynamics , quantum mechanics
A series of BaLi 2 Al 2 Si 2 N 6 (BLASN): x Eu 2+ phosphors are successfully synthesized and their crystal structure and luminescence properties under varying hydrostatic pressures are reported herein. Structure variation is analyzed using in situ high‐pressure X‐ray diffraction and Rietveld refinements. Based on decay curves and Gaussian fitting of emission spectra, the presence of two photoluminescence centers is demonstrated. BaLi 2 Al 2 Si 2 N 6 : 0.01Eu 2+ exhibits an evident peak position shift from 532 to 567 nm with an increase in pressure to ≈20 GPa. The possible factors and mechanisms for the variations are studied in detail. At a pressure of 16 GPa, BLASN: Eu 2+ realizes a narrow yellow emission with a full width at half maximum of ≈70 nm. The addition of BLASN: Eu 2+ (16 GPa) to the commercial white light‐emitting diodes combination consisting of an InGaN chip, β‐SiAlON: Eu 2+ , and red K 2 SiF 6 :Mn 4+ , can increase the color gamut by ≈15%, demonstrating the promising potential of pressure‐driven BLASN: Eu 2+ for wide‐color gamut spectroscopy applications. Moreover, the emission shifts arising from pressure variation and the distinct color changes enable its potential utility as an optical pressure sensor; the material exhibits high pressure sensitivity (dλ/d P ≈ 1.58 nm GPa −1 ) with the advantage of visualization.