Surface analysis and cathodoluminescence degradation of undoped ZnO and ZnO:Zn phosphors

Emad Hasabeldaim; Odireleng M. Ntwaeaborwa; Robert E. Kroon; Hendrik C. Swart

doi:10.1116/1.4953561

Surface analysis and cathodoluminescence degradation of undoped ZnO and ZnO:Zn phosphors

Emad Hasabeldaim, Odireleng M. Ntwaeaborwa, Robert E. Kroon, Hendrik C. Swart

University of The Free State

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

22 Citations (Scopus)

Abstract

Commercial ZnO:Zn and undoped ZnO with a hexagonal wurtzite structure (JCPDS 80-0075) were studied. The direct optical bandgaps were 3.25 and 3.28 eV for the undoped and ZnO:Zn, respectively. Undoped ZnO exhibited strong ultraviolet band to band emission as well as weak deep level defect emission around the green, orange, and red regions. ZnO:Zn emits only green light centered at 514 nm which was attributed to oxygen vacancies. Electron irradiated degradation of the ZnO:Zn sample showed a rapid initial decrease in cathodoluminescence intensity and then a subsequent recovery and increase to up to double the initial value during prolonged electron irradiation. Deconvoluted peaks of the O1s x-ray photoelectron peaks confirmed the presence of oxygen-related defects in both samples. The ZnO:Zn sample was found to be very stable under electron bombardment, which makes it suitable for the use in field emission displays.

Original language	English
Article number	041221
Journal	Journal of Vacuum Science and Technology B
Volume	34
Issue number	4
DOIs	https://doi.org/10.1116/1.4953561
Publication status	Published - 1 Jul 2016
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Instrumentation
Process Chemistry and Technology
Surfaces, Coatings and Films
Electrical and Electronic Engineering
Materials Chemistry

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abstract = "Commercial ZnO:Zn and undoped ZnO with a hexagonal wurtzite structure (JCPDS 80-0075) were studied. The direct optical bandgaps were 3.25 and 3.28 eV for the undoped and ZnO:Zn, respectively. Undoped ZnO exhibited strong ultraviolet band to band emission as well as weak deep level defect emission around the green, orange, and red regions. ZnO:Zn emits only green light centered at 514 nm which was attributed to oxygen vacancies. Electron irradiated degradation of the ZnO:Zn sample showed a rapid initial decrease in cathodoluminescence intensity and then a subsequent recovery and increase to up to double the initial value during prolonged electron irradiation. Deconvoluted peaks of the O1s x-ray photoelectron peaks confirmed the presence of oxygen-related defects in both samples. The ZnO:Zn sample was found to be very stable under electron bombardment, which makes it suitable for the use in field emission displays.",

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AU - Hasabeldaim, Emad

AU - Ntwaeaborwa, Odireleng M.

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AU - Swart, Hendrik C.

PY - 2016/7/1

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N2 - Commercial ZnO:Zn and undoped ZnO with a hexagonal wurtzite structure (JCPDS 80-0075) were studied. The direct optical bandgaps were 3.25 and 3.28 eV for the undoped and ZnO:Zn, respectively. Undoped ZnO exhibited strong ultraviolet band to band emission as well as weak deep level defect emission around the green, orange, and red regions. ZnO:Zn emits only green light centered at 514 nm which was attributed to oxygen vacancies. Electron irradiated degradation of the ZnO:Zn sample showed a rapid initial decrease in cathodoluminescence intensity and then a subsequent recovery and increase to up to double the initial value during prolonged electron irradiation. Deconvoluted peaks of the O1s x-ray photoelectron peaks confirmed the presence of oxygen-related defects in both samples. The ZnO:Zn sample was found to be very stable under electron bombardment, which makes it suitable for the use in field emission displays.

AB - Commercial ZnO:Zn and undoped ZnO with a hexagonal wurtzite structure (JCPDS 80-0075) were studied. The direct optical bandgaps were 3.25 and 3.28 eV for the undoped and ZnO:Zn, respectively. Undoped ZnO exhibited strong ultraviolet band to band emission as well as weak deep level defect emission around the green, orange, and red regions. ZnO:Zn emits only green light centered at 514 nm which was attributed to oxygen vacancies. Electron irradiated degradation of the ZnO:Zn sample showed a rapid initial decrease in cathodoluminescence intensity and then a subsequent recovery and increase to up to double the initial value during prolonged electron irradiation. Deconvoluted peaks of the O1s x-ray photoelectron peaks confirmed the presence of oxygen-related defects in both samples. The ZnO:Zn sample was found to be very stable under electron bombardment, which makes it suitable for the use in field emission displays.

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Surface analysis and cathodoluminescence degradation of undoped ZnO and ZnO:Zn phosphors

Abstract

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