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Bi$^{3+}$-doped Ba$_2$Y$_{1-x}$Lu$_x$NbO$_6$:Bi$^{3+}$ ($0 \leq x \leq 1.0$) solid solution phosphors: tunable photoluminescence and application for white LEDs
CHANGSHUN ZHOU CHENHUI JIANG JUN ZHAO PEIMIN ZHAN XUFANG TANG DINGFENG JIN XINXING WANG
Volume 44 Published: 13 February 2021 Article ID 0032
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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$^{-1}$.
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Author Affiliations
CHANGSHUN ZHOU1 2 CHENHUI JIANG1 JUN ZHAO3 PEIMIN ZHAN1 XUFANG TANG4 DINGFENG JIN4 XINXING WANG1
- Yuanpei College, Shaoxing University, Shaoxing 312000, People’s Republic of China
- Civil Engineering College, Central South University, Changsha, Hunan 410083, People’s Republic of China
- Sichuan College of Architectural Technology, Deyang 618000, People’s Republic of China
- College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, People’s Republic of China
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Dates
- Published
- 13 February 2021
- Manuscript received
- 28 April 2020
- Accepted
- 27 July 2020
- Final version published online
- 13 February 2021
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Bulletin of Materials Science
Volume 45, 2022
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Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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