Issue 7, 2023

Ba3LuGa2O7.5:Bi3+ phosphors with potential application in full-spectrum WLEDs and temperature sensing

Abstract

In this work, a series of novel, broadband, cyan-green emitting Ba3LuGa2O7.5:Bi3+ phosphors are prepared to bridge the cyan gap through a simple high-temperature solid-state reaction method. Their crystal structures, morphologies, luminescent properties, temperature-dependent emission spectra, temperature-dependent lifetime decay curves and quantum efficiencies were investigated in detail. Upon 351 nm excitation, the phosphor presents cyan-green emission with the main peak located at 500 nm, corresponding to the 3P11S0 transition of Bi3+ ions. The emission intensity of BLGO:0.02Bi3+ phosphors is greatly enhanced when introducing a suitable flux. The value of external quantum efficiency is advanced from 9.43% to 30.93%. According to the luminescence intensity and thermal quenching properties of the phosphor, the potential applications of BLGO:Bi3+ in the two fields of WLEDs and optical temperature sensing were explored. Since the excitation band of the phosphor can match well with that of the near-ultraviolet chip, combined with commercial phosphors, the BLGO:0.02Bi3+ phosphor is employed to obtain a full-spectrum WLED device with a higher color rendering index (CRI, Ra = 93.5), and a lower correlated color temperature (CCT, 4523 K). In the temperature range of 293 to 498 K, the relative sensitivities Sr and S are calculated to reach the maximum value of 2.05% K−1 and 2.21% K−1, respectively. These results indicated that the prepared BLGO:Bi3+ phosphors have potential application prospects as full-spectrum WLEDs and in temperature sensing.

Graphical abstract: Ba3LuGa2O7.5:Bi3+ phosphors with potential application in full-spectrum WLEDs and temperature sensing

Supplementary files

Article information

Article type
Paper
Submitted
05 Apr 2022
Accepted
06 Oct 2022
First published
31 Jan 2023

J. Mater. Chem. C, 2023,11, 2653-2663

Ba3LuGa2O7.5:Bi3+ phosphors with potential application in full-spectrum WLEDs and temperature sensing

R. Liu, H. Wu, S. Wang, W. Yuan, S. Zhang, R. Pang, L. Jiang, D. Li, C. Li and H. Zhang, J. Mater. Chem. C, 2023, 11, 2653 DOI: 10.1039/D2TC01386J

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