Ba3LuGa2O7.5:Bi3+ phosphors with potential application in full-spectrum WLEDs and temperature sensing. Issue 7 (31st January 2023)

• Record Type: Journal Article
• Authors: Liu, Ruize; Wu, Haiyan; Wang, Shangwei; Yuan, Weihong; Zhang, Su; Pang, Ran; Jiang, Lihong; Li, Da; Li, Chengyu; Zhang, Hongjie
• Is Part Of: Journal of materials chemistry. Volume 11:Issue 7(2023)
• Page Start: 2653
• Page End: 2663
• Publication Date: 2023-01-31
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc01386j
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : A novel n-UV activated phosphor Ba3 LuGa2 O7.5 :Bi 3+ with strong cyan emissions has been synthesized and systematically investigated. Abstract : In this work, a series of novel, broadband, cyan-green emitting Ba3 LuGa2 O7.5 :Bi 3+ 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 3 P1 – 1 S0 transition of Bi 3+ ions. The emission intensity of BLGO:0.02Bi 3+ 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:Bi 3+ 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:0.02Bi 3+ 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 S r 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:Bi 3+ phosphors have potential application prospects as full-spectrum WLEDs and in temperature sensing.