Photophysical properties of halide perovskite CsPb(Br1-xIx)3 thin films and nanowires
Journal article, 2020

Thin films and nanowires based on lead halide perovskites are promising objects for the design of various optoelectronic devices as well as nano- and microlasers. One of the main advantages of such materials is their absorption and photoluminescence spectra tuning across the visible range via the change in their chemical composition, for instance, by substitution of one halide atom (Br) for another one (I) in the crystal lattice of CsPb(Br1-xIx)3. However, this approach gives materials showing unstable photoluminescence behavior caused by light-induced perovskite phase separation under high-intensity excitation at room temperature. In this work, CsPb(Br1-xIx)3 thin films and nanowires are obtained by chemical vapor anion exchange method from their CsPbBr3 counterparts fabricated by improved wet chemical methods. Spontaneous and stimulated emission from the mixed-halide and pristine bromide samples are studied. Tribromide nanowires exhibit lasing with relatively low thresholds (10–100 μJ/cm2) and high Q-factor of the laser mode up to 3500. The temperature dependence of the photoinitiated phase separation in CsPbBr1.5I1.5 samples is investigated, showing that light-induced phase instability of the mixed-halide nanowires can be suppressed at the somewhat higher temperature (250 K) than the value observed for the thin films having a similar chemical composition. The results obtained are important for the optimization of the functioning of optoelectronic devices based on considered perovskite materials.

Cesium lead halide perovskite


Thin film

Mixed-halide perovskite




D. I. Markina

ITMO University

Ekaterina Y. Tiguntseva

ITMO University

Anatoly P. Pushkarev

ITMO University

M. A. Samsonov

University of Pardubice

M. Vengris

Vilnius University

Battulga Munkhbat

Nano and Biophysics

Timur Shegai

Nano and Biophysics

G. B. Hix

University of Wolverhampton

Anvar A. Zakhidov

University of Texas at Dallas

ITMO University

S. Makarov

ITMO University

Journal of Luminescence

0022-2313 (ISSN)

Vol. 220 116985

Subject Categories

Atom and Molecular Physics and Optics

Other Materials Engineering

Condensed Matter Physics



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