Experimental and theoretical studies of polaron optical properties in KNbO3 perovskite

L. Grigorjeva; D. K. Millers; V. Pankratov; R. T. Williams; R. I. Eglitis; E. A. Kotomin; G. Borstel

doi:10.1016/j.ssc.2003.12.031

Experimental and theoretical studies of polaron optical properties in KNbO₃ perovskite

L. Grigorjeva
, D. K. Millers
, V. Pankratov
, R. T. Williams
, R. I. Eglitis^*
, E. A. Kotomin
, G. Borstel

^*Corresponding author for this work

University of Latvia
Wake Forest University
Osnabrück University
Max Planck Institute for Solid State Research

Research output: Contribution to journal › Article › peer-review

38 Citations (Scopus)

Abstract

Time-resolved absorption and luminescence spectra have been measured in KNbO₃ perovskite crystals after pulsed band-gap excitation by 200 fs laser pulses and 10ns electron pulses. Quantum chemical calculations using the large unit cell periodic model support the interpretation of the observed transient absorption bands at 0.8 and 1.1eV as the self-trapped electron polarons and bound hole polarons, respectively. The activation energy for the 2.2eV green luminescence quenching is 0.05eV. We suggest that the short lifetime (<15ns) of the luminescence at RT is caused by the radiative recombination of nearest electron and hole polarons.

Original language	English
Pages (from-to)	691-696
Number of pages	6
Journal	Solid State Communications
Volume	129
Issue number	11
DOIs	https://doi.org/10.1016/j.ssc.2003.12.031
Publication status	Published - Mar 2004

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SDG 7 Affordable and Clean Energy

Keywords

A. ABO perovskites
A. Polarons
D. Optical properties

Access to Document

10.1016/j.ssc.2003.12.031

Cite this

@article{347b8939250348e5adc823458a0413e7,

title = "Experimental and theoretical studies of polaron optical properties in KNbO3 perovskite",

abstract = "Time-resolved absorption and luminescence spectra have been measured in KNbO3 perovskite crystals after pulsed band-gap excitation by 200 fs laser pulses and 10ns electron pulses. Quantum chemical calculations using the large unit cell periodic model support the interpretation of the observed transient absorption bands at 0.8 and 1.1eV as the self-trapped electron polarons and bound hole polarons, respectively. The activation energy for the 2.2eV green luminescence quenching is 0.05eV. We suggest that the short lifetime (<15ns) of the luminescence at RT is caused by the radiative recombination of nearest electron and hole polarons.",

keywords = "A. ABO perovskites, A. Polarons, D. Optical properties",

author = "L. Grigorjeva and Millers, \{D. K.\} and V. Pankratov and Williams, \{R. T.\} and Eglitis, \{R. I.\} and Kotomin, \{E. A.\} and G. Borstel",

year = "2004",

month = mar,

doi = "10.1016/j.ssc.2003.12.031",

language = "English",

volume = "129",

pages = "691--696",

journal = "Solid State Communications",

issn = "0038-1098",

publisher = "Elsevier Ltd",

number = "11",

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TY - JOUR

T1 - Experimental and theoretical studies of polaron optical properties in KNbO3 perovskite

AU - Grigorjeva, L.

AU - Millers, D. K.

AU - Pankratov, V.

AU - Williams, R. T.

AU - Eglitis, R. I.

AU - Kotomin, E. A.

AU - Borstel, G.

PY - 2004/3

Y1 - 2004/3

N2 - Time-resolved absorption and luminescence spectra have been measured in KNbO3 perovskite crystals after pulsed band-gap excitation by 200 fs laser pulses and 10ns electron pulses. Quantum chemical calculations using the large unit cell periodic model support the interpretation of the observed transient absorption bands at 0.8 and 1.1eV as the self-trapped electron polarons and bound hole polarons, respectively. The activation energy for the 2.2eV green luminescence quenching is 0.05eV. We suggest that the short lifetime (<15ns) of the luminescence at RT is caused by the radiative recombination of nearest electron and hole polarons.

AB - Time-resolved absorption and luminescence spectra have been measured in KNbO3 perovskite crystals after pulsed band-gap excitation by 200 fs laser pulses and 10ns electron pulses. Quantum chemical calculations using the large unit cell periodic model support the interpretation of the observed transient absorption bands at 0.8 and 1.1eV as the self-trapped electron polarons and bound hole polarons, respectively. The activation energy for the 2.2eV green luminescence quenching is 0.05eV. We suggest that the short lifetime (<15ns) of the luminescence at RT is caused by the radiative recombination of nearest electron and hole polarons.

KW - A. ABO perovskites

KW - A. Polarons

KW - D. Optical properties

UR - https://www.scopus.com/pages/publications/0742284399

U2 - 10.1016/j.ssc.2003.12.031

DO - 10.1016/j.ssc.2003.12.031

M3 - Article

AN - SCOPUS:0742284399

SN - 0038-1098

VL - 129

SP - 691

EP - 696

JO - Solid State Communications

JF - Solid State Communications

IS - 11

ER -