Some features of absorption and photoluminescence of wulfenite (PbMoO4) crystals

A description of experimental results of studying the optical absorption and photoluminescence (PL) of tetragonal (class 4/m ) PbMoO4 crystals is given. The light transmitted and reflected in the polarized radiation for both orientation (E || C4 and E ┴ C4,) at 300 and 77 K is measured. The spectral...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Muşinschi, Valeriu, Muşinschi, C
Formato:	article
Lenguaje:	EN
Publicado:	D.Ghitu Institute of Electronic Engineering and Nanotechnologies 2012
Materias:	Physics QC1-999 Electronics TK7800-8360
Acceso en línea:	https://doaj.org/article/5616b96d3f8641d3b860c06bd70d33ac
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:5616b96d3f8641d3b860c06bd70d33ac
record_format	dspace
spelling	oai:doaj.org-article:5616b96d3f8641d3b860c06bd70d33ac2021-11-21T12:01:09ZSome features of absorption and photoluminescence of wulfenite (PbMoO4) crystals2537-63651810-648Xhttps://doaj.org/article/5616b96d3f8641d3b860c06bd70d33ac2012-10-01T00:00:00Zhttps://mjps.nanotech.md/archive/2012/article/21328https://doaj.org/toc/1810-648Xhttps://doaj.org/toc/2537-6365A description of experimental results of studying the optical absorption and photoluminescence (PL) of tetragonal (class 4/m ) PbMoO4 crystals is given. The light transmitted and reflected in the polarized radiation for both orientation (E \|\| C4 and E ┴ C4,) at 300 and 77 K is measured. The spectral dependence of the absorption coefficient at the edge absorption (λ ≈ 0.30.5 μm) shows that the edge absorption is determined by phonon-assisted indirect transitions. Spectral characteristics of the absorption coefficient of crystals with two radiation polarizations in the temperature range from 77 to 300 K are investigated. The measured spectral dependence of the absorption coefficient at two orientation of polarization of light and the known theoretical dependence were combined and compared for determination the types of optical transitions in fundamental absorption of PbMoO4 crystals. Limited energies Eg ind and Eg dir for E\|\| C4 and E ┴ C4 were found. A detailed investigation of the fundamental absorption of PbMoO4 crystals is given. The direct optical edge Eg at T = 300 K is 3.28 eV and 3.36 eV for E \|\| C4 and E ┴ C4, respectively. Pure lead molybdate single crystals grown by the Czochralski method were investigated by optical absorption and PL methods. The radiative recombination mainly for interbands transitions in PbMoO4 crystals excited with a 365-nm wavelength was observed and analyzed. All PL spectra undergo a Stokes shift and can be characterized by a large half-width. The absorption spectra were compared with both PL and calculated emission intensity for a degenerate electron gas of the conduction band and nondegenerate hole gas in the valence band for direct transitions [1]Muşinschi, ValeriuMuşinschi, CD.Ghitu Institute of Electronic Engineering and NanotechnologiesarticlePhysicsQC1-999ElectronicsTK7800-8360ENMoldavian Journal of the Physical Sciences, Vol 11, Iss 3, Pp 163-169 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronics TK7800-8360
spellingShingle	Physics QC1-999 Electronics TK7800-8360 Muşinschi, Valeriu Muşinschi, C Some features of absorption and photoluminescence of wulfenite (PbMoO4) crystals
description	A description of experimental results of studying the optical absorption and photoluminescence (PL) of tetragonal (class 4/m ) PbMoO4 crystals is given. The light transmitted and reflected in the polarized radiation for both orientation (E \|\| C4 and E ┴ C4,) at 300 and 77 K is measured. The spectral dependence of the absorption coefficient at the edge absorption (λ ≈ 0.30.5 μm) shows that the edge absorption is determined by phonon-assisted indirect transitions. Spectral characteristics of the absorption coefficient of crystals with two radiation polarizations in the temperature range from 77 to 300 K are investigated. The measured spectral dependence of the absorption coefficient at two orientation of polarization of light and the known theoretical dependence were combined and compared for determination the types of optical transitions in fundamental absorption of PbMoO4 crystals. Limited energies Eg ind and Eg dir for E\|\| C4 and E ┴ C4 were found. A detailed investigation of the fundamental absorption of PbMoO4 crystals is given. The direct optical edge Eg at T = 300 K is 3.28 eV and 3.36 eV for E \|\| C4 and E ┴ C4, respectively. Pure lead molybdate single crystals grown by the Czochralski method were investigated by optical absorption and PL methods. The radiative recombination mainly for interbands transitions in PbMoO4 crystals excited with a 365-nm wavelength was observed and analyzed. All PL spectra undergo a Stokes shift and can be characterized by a large half-width. The absorption spectra were compared with both PL and calculated emission intensity for a degenerate electron gas of the conduction band and nondegenerate hole gas in the valence band for direct transitions [1]
format	article
author	Muşinschi, Valeriu Muşinschi, C
author_facet	Muşinschi, Valeriu Muşinschi, C
author_sort	Muşinschi, Valeriu
title	Some features of absorption and photoluminescence of wulfenite (PbMoO4) crystals
title_short	Some features of absorption and photoluminescence of wulfenite (PbMoO4) crystals
title_full	Some features of absorption and photoluminescence of wulfenite (PbMoO4) crystals
title_fullStr	Some features of absorption and photoluminescence of wulfenite (PbMoO4) crystals
title_full_unstemmed	Some features of absorption and photoluminescence of wulfenite (PbMoO4) crystals
title_sort	some features of absorption and photoluminescence of wulfenite (pbmoo4) crystals
publisher	D.Ghitu Institute of Electronic Engineering and Nanotechnologies
publishDate	2012
url	https://doaj.org/article/5616b96d3f8641d3b860c06bd70d33ac
work_keys_str_mv	AT musinschivaleriu somefeaturesofabsorptionandphotoluminescenceofwulfenitepbmoo4crystals AT musinschic somefeaturesofabsorptionandphotoluminescenceofwulfenitepbmoo4crystals
_version_	1718419304165146624

Some features of absorption and photoluminescence of wulfenite (PbMoO4) crystals

Ejemplares similares