Luminescence characteristics of magnesium aluminate spinel crystals of different stoichiometry

G. Prieditis; E. Feldbach; I. Kudryavtseva; A. I. Popov; E. Shablonin; A. Lushchik

doi:10.1088/1757-899X/503/1/012021

Luminescence characteristics of magnesium aluminate spinel crystals of different stoichiometry

G. Prieditis
, E. Feldbach
, I. Kudryavtseva
, A. I. Popov
, E. Shablonin
, A. Lushchik

Laboratory of Kinetics in Self-Organizing Systems, Institute of Solid State Physics

University of Tartu

Research output: Contribution to journal › Conference article › peer-review

25 Citations (Scopus)

Abstract

Magnesium aluminate spinel single crystals with different stoichiometry, MgAl₂O₄ (1:1 spinel) and MgO 2.5Al₂O₃ (1:2.5) were investigated using different optical methods (cathode-, photo- and thermally stimulated luminescence (TSL), optical absorption, "creation spectra" of TSL peaks and phosphorescence by VUV radiation). Low-temperature charge carrier traps and the position of intrinsic UV emission bands depend on the degree of stoichiometry. Antisite defects (ADs), Mg²⁺ or Al³⁺ located in a "wrong" cation site (Mg|_A1 or Al|_Mg) are the main as-grown structural defects, which serve also as efficient traps for electrons and holes as well as seeds for bound excitons. AD concentration is especially high in 1:2.5 spinel. There are several manifestations of ADs (electronic excitations near ADs) in the spectral region of 7-7.5 eV, slightly below the energy gap.

Original language	English
Article number	012021
Journal	IOP Conference Series: Materials Science and Engineering
Volume	503
Issue number	1
DOIs	https://doi.org/10.1088/1757-899X/503/1/012021
Publication status	Published - 25 Mar 2019
Event	12th International Scientific Conference on Functional Materials and Nanotechnologies, FM and NT 2018 - Riga, Latvia Duration: 2 Oct 2018 → 5 Oct 2018

Access to Document

10.1088/1757-899X/503/1/012021

Cite this

@article{86396d375d844cf9abf653ab1a09baaa,

title = "Luminescence characteristics of magnesium aluminate spinel crystals of different stoichiometry",

abstract = "Magnesium aluminate spinel single crystals with different stoichiometry, MgAl2O4 (1:1 spinel) and MgO 2.5Al2O3 (1:2.5) were investigated using different optical methods (cathode-, photo- and thermally stimulated luminescence (TSL), optical absorption, {"}creation spectra{"} of TSL peaks and phosphorescence by VUV radiation). Low-temperature charge carrier traps and the position of intrinsic UV emission bands depend on the degree of stoichiometry. Antisite defects (ADs), Mg2+ or Al3+ located in a {"}wrong{"} cation site (Mg|A1 or Al|Mg) are the main as-grown structural defects, which serve also as efficient traps for electrons and holes as well as seeds for bound excitons. AD concentration is especially high in 1:2.5 spinel. There are several manifestations of ADs (electronic excitations near ADs) in the spectral region of 7-7.5 eV, slightly below the energy gap.",

author = "G. Prieditis and E. Feldbach and I. Kudryavtseva and Popov, \{A. I.\} and E. Shablonin and A. Lushchik",

note = "Publisher Copyright: {\textcopyright} Published under licence by IOP Publishing Ltd.; 12th International Scientific Conference on Functional Materials and Nanotechnologies, FM and NT 2018 ; Conference date: 02-10-2018 Through 05-10-2018",

year = "2019",

month = mar,

day = "25",

doi = "10.1088/1757-899X/503/1/012021",

language = "English",

volume = "503",

journal = "IOP Conference Series: Materials Science and Engineering",

issn = "1757-8981",

publisher = "IOP Publishing Ltd.",

number = "1",

}

TY - JOUR

T1 - Luminescence characteristics of magnesium aluminate spinel crystals of different stoichiometry

AU - Prieditis, G.

AU - Feldbach, E.

AU - Kudryavtseva, I.

AU - Popov, A. I.

AU - Shablonin, E.

AU - Lushchik, A.

N1 - Publisher Copyright: © Published under licence by IOP Publishing Ltd.

PY - 2019/3/25

Y1 - 2019/3/25

N2 - Magnesium aluminate spinel single crystals with different stoichiometry, MgAl2O4 (1:1 spinel) and MgO 2.5Al2O3 (1:2.5) were investigated using different optical methods (cathode-, photo- and thermally stimulated luminescence (TSL), optical absorption, "creation spectra" of TSL peaks and phosphorescence by VUV radiation). Low-temperature charge carrier traps and the position of intrinsic UV emission bands depend on the degree of stoichiometry. Antisite defects (ADs), Mg2+ or Al3+ located in a "wrong" cation site (Mg|A1 or Al|Mg) are the main as-grown structural defects, which serve also as efficient traps for electrons and holes as well as seeds for bound excitons. AD concentration is especially high in 1:2.5 spinel. There are several manifestations of ADs (electronic excitations near ADs) in the spectral region of 7-7.5 eV, slightly below the energy gap.

AB - Magnesium aluminate spinel single crystals with different stoichiometry, MgAl2O4 (1:1 spinel) and MgO 2.5Al2O3 (1:2.5) were investigated using different optical methods (cathode-, photo- and thermally stimulated luminescence (TSL), optical absorption, "creation spectra" of TSL peaks and phosphorescence by VUV radiation). Low-temperature charge carrier traps and the position of intrinsic UV emission bands depend on the degree of stoichiometry. Antisite defects (ADs), Mg2+ or Al3+ located in a "wrong" cation site (Mg|A1 or Al|Mg) are the main as-grown structural defects, which serve also as efficient traps for electrons and holes as well as seeds for bound excitons. AD concentration is especially high in 1:2.5 spinel. There are several manifestations of ADs (electronic excitations near ADs) in the spectral region of 7-7.5 eV, slightly below the energy gap.

UR - https://www.scopus.com/pages/publications/85064855422

U2 - 10.1088/1757-899X/503/1/012021

DO - 10.1088/1757-899X/503/1/012021

M3 - Conference article

AN - SCOPUS:85064855422

SN - 1757-8981

VL - 503

JO - IOP Conference Series: Materials Science and Engineering

JF - IOP Conference Series: Materials Science and Engineering

IS - 1

M1 - 012021

T2 - 12th International Scientific Conference on Functional Materials and Nanotechnologies, FM and NT 2018

Y2 - 2 October 2018 through 5 October 2018

ER -

Luminescence characteristics of magnesium aluminate spinel crystals of different stoichiometry

Abstract

Access to Document

Other files and links

Fingerprint

Cite this