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      https://www.ias.ac.in/article/fulltext/boms/044/0032

    • Keywords

       

      Bi$^{3+}$; perovskite; tunable photoluminescence; white LEDs.

    • Abstract

       

      In this work, we use the conventional high temperature solid-state reaction to prepare Bi$^{3+}$-doped Ba$_2$Y$_{1-x}$Lu$_x$NbO$_6$:Bi$^{3+}$ ($0 \leq x \leq 1.0$) solid solution phosphors. To study the Lu$^{3+}$ content-dependent structural evolution and photoluminescence (PL) properties of the samples, the powder X-ray diffraction (pXRD), density functional theoretical (DFT) calculations, UV–visible diffuse reflectance and PL spectra are used. We find that all the phosphors are double-perovskite structural phase with a cubic space group of Fm$\bar{3}$m, and the XRD positions shift to higher diffraction angle with the increase in Lu$^{3+}$ content. The emission positions of the samples tune from 447 to 493 nm, which are due to the crystal field modulation around the Bi3? ion. Among the obtained samples, the Ba$_2$Y$_{0.7}$Lu$_{0.3}$NbO$_6$:Bi$^{3+}$ shows the bestquantum efficiency (QE) of 57%. By using the optimal Ba$_2$Y$_{0.7}$Lu$_{0.3}$NbO$_6$:Bi$^{3+}$ solid solution phosphor, the red-emitting CaAlSiN:Eu$^{2+}$ phosphor, and a commercial 365 nm UV LED chip, we have fabricated a white LED device with the CIE coordinates at (0.378, 0.373), colour temperature (CT) of 3513 K, colour rendering index (CRI) of 67.1 and luminous efficiency of 39 lm W$^{-1}$.

    • Author Affiliations

       

      CHANGSHUN ZHOU1 2 CHENHUI JIANG1 JUN ZHAO3 PEIMIN ZHAN1 XUFANG TANG4 DINGFENG JIN4 XINXING WANG1

      1. Yuanpei College, Shaoxing University, Shaoxing 312000, People’s Republic of China
      2. Civil Engineering College, Central South University, Changsha, Hunan 410083, People’s Republic of China
      3. Sichuan College of Architectural Technology, Deyang 618000, People’s Republic of China
      4. College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, People’s Republic of China
    • Dates

       
  • Bulletin of Materials Science | News

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