Open AccessSuperbroad visible to NIR photoluminescence from Bi^+ evidenced in Ba_2B_5O_9Cl: Bi crystal
Author(s) -
Jiayu Zheng,
Linling Tan,
Liping Wang,
Mingying Peng,
Shanhui Xu
Publication year - 2016
Publication title -
optics express
Language(s) - Slovenian
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.002830
Subject(s) - bismuth , luminescence , materials science , photoluminescence , laser , optics , optoelectronics , doping , crystal (programming language) , physics , computer science , metallurgy , programming language
The nature of bismuth NIR luminescence is essential to develop the bismuth doped laser materials with high efficiency and desirable emission wavelength, and it, thereby, receives rising interests. Our previous work reported the Bi(0) luminescence from Ba2B5O9Cl: Bi with a lifetime of ~30 μs and the conversion of Bi(2+) to Bi(0). This work found indeed the conversion could be enabled in the compound by an in situ reduction technique and it, however, happens via an intermediate state of Bi(+). Once the ion of Bi(+) is stabilized and built into the compound, it can luminesce in a super broad spectral range from 600 to 1200 nm with a lifetime longer than 1 ms, due to the cascade transitions from (3)P2 and (3)P1 to (3)P0. This is completely different from Bi(0) and Bi(2+) in the compound, and it has never been noticed before. We believe this work can help us better understand the complex nature of bismuth luminescence.