期刊
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
卷 15, 期 4, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.202000519
关键词
lasing; microcrystals; nanosecond lifetime; pair emission; perovskites
资金
- DST, Government of India [SR/NM/NAT/02-2005, DST/NM/JIIT/01-2016, SR/NM/NT-01/2016]
Lasing is observed in microcrystals of the Ga:LaCrO3 perovskite system due to pair emission of Cr3+ ions. The ceramic material shows appreciable lasing profile under 488 nm laser pumping. Enhanced lasing characteristics are seen in low-temperature ranges, with the short lifetime attributed to the high concentration of Cr3+ ions enhancing pair emission.
Lasing is observed in microcrystals of the Ga:LaCrO3 (LaCr0.5Ga0.5O3) perovskite system due to the pair emission of the Cr3+ ions, with a lifetime in the sub-nanosecond range. Lasing due to pair emission is difficult to achieve in single-crystal materials because of the difficulty in obtaining the dopant's compositional uniformity. This captivating ceramic material reveals an appreciable lasing profile with a 488 nm laser pumping. Characteristic laser emission centered at 740 nm is observed, with a linewidth of 2.09 nm and a threshold power of 73 W cm(-2) at room temperature. Photoluminescence (PL) spectra show enhanced lasing characteristics at low-temperature ranges. The time-resolved PL spectrum of the sample illustrates a sub-nanosecond lifetime of which 99.2% of the lifetime contribution is from pair emission. The short lifetime can be attributed to the high concentration of the Cr3+ ions, which enhances the Cr3+-Cr3+ exchange interaction, and pair emission, which is evidenced by an electron spin resonance study.
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