Eu3+-Doped (Gd, La)AlO3 Perovskite Single Crystals: Growth and Red-Emitting Luminescence

Tong Wu; Qian Zhang; Yun Shi; Ling Wang; Yifei Xiong; Hui Wang; Jinghong Fang; Jinqi Ni; Huan He; Zhenzhen Zhou; Qian Liu; Jianding Yu

doi:10.3390/ma16020488

Eu³⁺-Doped (Gd, La)AlO₃ Perovskite Single Crystals: Growth and Red-Emitting Luminescence

Materials (Basel). 2023 Jan 4;16(2):488. doi: 10.3390/ma16020488.

Authors

Tong Wu^{1

2}, Qian Zhang¹, Yun Shi^{1

3}, Ling Wang^{1

2}, Yifei Xiong¹, Hui Wang¹, Jinghong Fang¹, Jinqi Ni¹, Huan He¹, Zhenzhen Zhou¹, Qian Liu¹, Jianding Yu^{1

3}

Affiliations

¹ State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
² College of Physical Science and Technology, Central China Normal University, Wuhan 430079, China.
³ Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.

Abstract

Eu³⁺-doped GdAlO₃ (Eu:GAP) and Gd_0.5La_0.5AlO₃ (Eu:GLAP) perovskite single crystals were successfully grown using the optical floating zone (OFZ) method. The microstructure, optical, photoluminescence (PL) and radioluminescence (under X-ray excitation, XEL) were investigated. Under the PL excitation of 275 nm, obvious emission bands peaking at 556 nm, 592 nm, 617 nm, 625 nm, 655 nm, and 706 nm were demonstrated, which correspond to the 5D₀ → 7F_j (j = 0-4) transitions of Eu³⁺. The grown Eu:GAP single crystal showed a stronger PL intensity compared with that of Eu:GLAP in the red light region. After annealing at 1000 °C for 4 h in weak reductive atmosphere (Ar + 5% H₂), a slight redshift and dramatic enhancement of PL and XEL intensity occurred. In addition, Eu:GLAP show a more intense XEL emission than that of Eu:GAP. Considering their different densities, these two kinds of red luminescence phosphors are proposed to be promising in a wide field of X-ray imaging, warm white, or plant lighting, respectively.

Keywords: Eu:GdAlO3 crystal; X-ray imaging; optical floating zone method; plant lighting; red emission.

Abstract

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