Influence of excitation wavelength on photoluminescence spectra of Al doped ZnO films

Firoz Khan; Sadia Ameen; Minwu Song; Hyung Shik Shin

doi:10.1016/j.jlumin.2012.08.054

Influence of excitation wavelength on photoluminescence spectra of Al doped ZnO films

Firoz Khan
, Sadia Ameen
, Minwu Song
, Hyung Shik Shin^*

^*Corresponding author for this work

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

20 Scopus citations

Abstract

Dependence of photoluminescence (PL) spectra of Al doped zinc oxide (AZO) films in near band edge (NBE) and green regions on the excitation wavelength (λ_ex) has been investigated. A redshift has been observed in both the regions with increase of λ_ex. The redshift of free exciton emission (FX) peaks with increase of λ_ex may be due to different contributions of excitonic emissions and their phonon replicas. The intensity of these peaks decreases exponentially with increase of λ_ex. The peaks related to first order transverse optical longitudinal optical replicas of the FX (FX-TO-1LO) phonon replica disappeared beyond λ_ex=220 nm. The peaks assigned to FX_A ⁿ⁼¹ and FX_Aⁿ⁼² become visible for λ_ex≥340 nm and become stronger for λ_ex= 360 nm. The separation between the two consecutive phonon replicas decreases with decrease of excitation energy due to more activity of lower energy phonon replicas. In case of undoped ZnO films, three emission peaks in NBE, blue and green regions have been observed. The redshifting with increase of λ_ex in NBE, blue and green regions are found to be 7, 2 and 13 meV, respectively.

Original language	English
Pages (from-to)	160-164
Number of pages	5
Journal	Journal of Luminescence
Volume	134
DOIs	https://doi.org/10.1016/j.jlumin.2012.08.054
State	Published - Feb 2013
Externally published	Yes

Keywords

Excitation wavelength
Phonon replicas
Photoluminescence
Zinc oxide

ASJC Scopus subject areas

Biophysics
Atomic and Molecular Physics, and Optics
General Chemistry
Biochemistry
Condensed Matter Physics

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10.1016/j.jlumin.2012.08.054

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title = "Influence of excitation wavelength on photoluminescence spectra of Al doped ZnO films",

abstract = "Dependence of photoluminescence (PL) spectra of Al doped zinc oxide (AZO) films in near band edge (NBE) and green regions on the excitation wavelength (λex) has been investigated. A redshift has been observed in both the regions with increase of λex. The redshift of free exciton emission (FX) peaks with increase of λex may be due to different contributions of excitonic emissions and their phonon replicas. The intensity of these peaks decreases exponentially with increase of λex. The peaks related to first order transverse optical longitudinal optical replicas of the FX (FX-TO-1LO) phonon replica disappeared beyond λex=220 nm. The peaks assigned to FXA n=1 and FXAn=2 become visible for λex≥340 nm and become stronger for λex= 360 nm. The separation between the two consecutive phonon replicas decreases with decrease of excitation energy due to more activity of lower energy phonon replicas. In case of undoped ZnO films, three emission peaks in NBE, blue and green regions have been observed. The redshifting with increase of λex in NBE, blue and green regions are found to be 7, 2 and 13 meV, respectively.",

keywords = "Excitation wavelength, Phonon replicas, Photoluminescence, Zinc oxide",

author = "Firoz Khan and Sadia Ameen and Minwu Song and \{Shik Shin\}, Hyung",

year = "2013",

month = feb,

doi = "10.1016/j.jlumin.2012.08.054",

language = "English",

volume = "134",

pages = "160--164",

journal = "Journal of Luminescence",

issn = "0022-2313",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Influence of excitation wavelength on photoluminescence spectra of Al doped ZnO films

AU - Khan, Firoz

AU - Ameen, Sadia

AU - Song, Minwu

AU - Shik Shin, Hyung

PY - 2013/2

Y1 - 2013/2

N2 - Dependence of photoluminescence (PL) spectra of Al doped zinc oxide (AZO) films in near band edge (NBE) and green regions on the excitation wavelength (λex) has been investigated. A redshift has been observed in both the regions with increase of λex. The redshift of free exciton emission (FX) peaks with increase of λex may be due to different contributions of excitonic emissions and their phonon replicas. The intensity of these peaks decreases exponentially with increase of λex. The peaks related to first order transverse optical longitudinal optical replicas of the FX (FX-TO-1LO) phonon replica disappeared beyond λex=220 nm. The peaks assigned to FXA n=1 and FXAn=2 become visible for λex≥340 nm and become stronger for λex= 360 nm. The separation between the two consecutive phonon replicas decreases with decrease of excitation energy due to more activity of lower energy phonon replicas. In case of undoped ZnO films, three emission peaks in NBE, blue and green regions have been observed. The redshifting with increase of λex in NBE, blue and green regions are found to be 7, 2 and 13 meV, respectively.

AB - Dependence of photoluminescence (PL) spectra of Al doped zinc oxide (AZO) films in near band edge (NBE) and green regions on the excitation wavelength (λex) has been investigated. A redshift has been observed in both the regions with increase of λex. The redshift of free exciton emission (FX) peaks with increase of λex may be due to different contributions of excitonic emissions and their phonon replicas. The intensity of these peaks decreases exponentially with increase of λex. The peaks related to first order transverse optical longitudinal optical replicas of the FX (FX-TO-1LO) phonon replica disappeared beyond λex=220 nm. The peaks assigned to FXA n=1 and FXAn=2 become visible for λex≥340 nm and become stronger for λex= 360 nm. The separation between the two consecutive phonon replicas decreases with decrease of excitation energy due to more activity of lower energy phonon replicas. In case of undoped ZnO films, three emission peaks in NBE, blue and green regions have been observed. The redshifting with increase of λex in NBE, blue and green regions are found to be 7, 2 and 13 meV, respectively.

KW - Excitation wavelength

KW - Phonon replicas

KW - Photoluminescence

KW - Zinc oxide

UR - https://www.scopus.com/pages/publications/84869509430

U2 - 10.1016/j.jlumin.2012.08.054

DO - 10.1016/j.jlumin.2012.08.054

M3 - Article

AN - SCOPUS:84869509430

SN - 0022-2313

VL - 134

SP - 160

EP - 164

JO - Journal of Luminescence

JF - Journal of Luminescence

ER -

Influence of excitation wavelength on photoluminescence spectra of Al doped ZnO films

Abstract

Keywords

ASJC Scopus subject areas

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