CC BY
3The impact of Cd-doping on optical properties of all-inorganic
halide perovskite microdisks
D. Tatarinov1, E. Sapozhnikova1*, A. Pushkarev1
1-ITMO University, Kronverksky pr. 49, bldg. A, 197101, St. Petersburg, Russia
Substitution of Pb2+ by Cd2+ in all-inorganic lead halide perovskite crystal lattice has been established as a promising strategy to give control over photoluminescence (PL) spectrum, electric conductivity, and light- and electric field-induced ion segregation in alloyed compositions [1-3].
In our work, we employ pressure-assisted high temperature recrystallization to produce bulk CsPbi-xCdxBr3 perovskites for persistent lasing. Obtained microdisks enable to discover a reliable correlation between quantitative energy dispersive X-ray (EDX) spectroscopy data and PL. Time-resolved measurements reveal delayed radiative electron-hole recombination which could be explained by reversible electron r ^ R-point transfer in the conduction band. Microdisks loaded with low Cd content show rapid deterioration of bright green PL under high fluence quasi-continuous-wave (Q-CW) laser excitation, whereas the high content results in persistent, however, low-intensity blue emission. We propose such a dramatic difference in temporal stability of lightly and heavily doped samples stems from reduced Auger recombination in the latter. Finally, the optimal Cd content of ca. 6% improves temporal stability of whispering gallery mode (WGM) lasing in microdisks by 3 times as compared to that of pure CsPbBr3 counterparts.
This work was supported by the Russian Science Foundation (project no. 23-72-00031).
[1] M. Imran, J. Ramade, F. Di Stasio, M. De Franco, J. Buha, S. Van Aert, L. Goldoni, S. Lauciello, M. Prato, I. Infante, S. Bals, L. Manna, Alloy CsCdxPb1-xBr3 Perovskite Nanocrystals: The Role of Surface Passivation in Preserving Composition and Blue Emission, Chem. Mater., 32, 10641-10652 (2020).
[2] J. Guo, Y. Fu, M. Lu, X. Zhang, S.V. Kershaw, J. Zhang, S. Luo, Y. Li, W.W. Yu, A.L. Rogach, L. Zhang, X. Bai, Cd-Rich Alloyed CsPb1.xCdxBr3 Perovskite Nanorods with Tunable Blue Emission and Fermi Levels Fabricated through Crystal Phase Engineering, Adv. Sci., 7, 2000930 (2020).
[3] S.S. Anoshkin, E.V. Sapozhnikova, Y. Feng, Y. Ju, A. Pavlov, R.G. Polozkov, A. Yulin, H. Zhong, A.P. Pushkarev, Blue-Emitting Cs(Pb,Cd)Br3 Nanocrystals Resistant to Electric Field-Induced Ion Segregation, ACS Appl. Mater. Interfaces, 16, 11656-11664 (2024).
