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Bi 3+ ‐Er 3+ and Bi 3+ ‐Yb 3+ Codoped Cs 2 AgInCl 6 Double Perovskite Near‐Infrared Emitters
Author(s) -
Arfin Habibul,
Kaur Jagjit,
Sheikh Tariq,
Chakraborty Sudip,
Nag Angshuman
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202002721
Subject(s) - lanthanide , photoluminescence , excited state , materials science , perovskite (structure) , analytical chemistry (journal) , halide , ion , excitation , photon upconversion , doping , atomic physics , chemistry , inorganic chemistry , optoelectronics , crystallography , physics , organic chemistry , chromatography , quantum mechanics
Bi 3+ and lanthanide ions have been codoped in metal oxides as optical sensitizers and emitters. But such codoping is not known in typical semiconductors such as Si, GaAs, and CdSe. Metal halide perovskite with coordination number 6 provides an opportunity to codope Bi 3+ and lanthanide ions. Codoping of Bi 3+ and Ln 3+ (Ln=Er and Yb) in Cs 2 AgInCl 6 double perovskite is presented. Bi 3+ ‐Er 3+ codoped Cs 2 AgInCl 6 shows Er 3+ f‐electron emission at 1540 nm (suitable for low‐loss optical communication). Bi 3+ codoping decreases the excitation (absorption) energy, such that the samples can be excited with ca. 370 nm light. At that excitation, Bi 3+ ‐Er 3+ codoped Cs 2 AgInCl 6 shows ca. 45 times higher emission intensity compared to the Er 3+ doped Cs 2 AgInCl 6 . Similar results are also observed in Bi 3+ ‐Yb 3+ codoped sample emitting at 994 nm. A combination of temperature‐dependent (5.7 K to 423 K) photoluminescence and calculations is used to understand the optical sensitization and emission processes.