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

^*Šī darba korespondējošais autors

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

Zinātniskās darbības rezultāts: Devums žurnālam › Zinātniskais raksts (žurnālā) › koleģiāli recenzēts

38 Atsauces (Scopus)

Kopsavilkums

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.

Oriģinālvaloda	Angļu
Lapas (no-līdz)	691-696
Lapu skaits	6
Žurnāls	Solid State Communications
Sējums	129
Izdevuma numurs	11
DOIs	https://doi.org/10.1016/j.ssc.2003.12.031
Publikācijas statuss	Publicēts - marts 2004

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10.1016/j.ssc.2003.12.031

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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",

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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 -