Publication detail

Aging characteristics of green-emitting Zn2GeO4:Mn alternating-current thin-film electroluminescent devices

AHMED, M.

Original Title

Aging characteristics of green-emitting Zn2GeO4:Mn alternating-current thin-film electroluminescent devices

English Title

Aging characteristics of green-emitting Zn2GeO4:Mn alternating-current thin-film electroluminescent devices

Type

conference paper

Language

en

Original Abstract

Electrical, electro-optic, temperature, and aging characteristics of green-emittingZn2GeO4:Mn alternating-current thin-film electroluminescent (ACTFEL) devices are presented. The Zn2GeO4:Mn phosphor layers are prepared by rf sputtering. A maximum luminous efficiency of 0.45 lm/W and luminance of 105 cd/m2 at 50 Hz and 40 V above threshold are obtained. Field-ionization of impact-excited Mn+2 luminescent impurities is found to give rise to positive space charge within the Zn2GeO4 phosphor, leading to unusual device behaviors such as conduction current delay, anomalous positive polarity transient luminance annihilation, transferred charge being comprised of mainly relaxation charge, and a decrease in the 50 Hz threshold voltage with increasing temperature. Low temperature aging experiments suggest that aging is at least partially due to hot electron-induced degradation. Although most Zn2GeO4:Mn ACTFEL devices exhibit a moderate amount of aging, certain devices are found to exhibit no measurable aging at 1 kHz when aged for 24 hours.

English abstract

Electrical, electro-optic, temperature, and aging characteristics of green-emittingZn2GeO4:Mn alternating-current thin-film electroluminescent (ACTFEL) devices are presented. The Zn2GeO4:Mn phosphor layers are prepared by rf sputtering. A maximum luminous efficiency of 0.45 lm/W and luminance of 105 cd/m2 at 50 Hz and 40 V above threshold are obtained. Field-ionization of impact-excited Mn+2 luminescent impurities is found to give rise to positive space charge within the Zn2GeO4 phosphor, leading to unusual device behaviors such as conduction current delay, anomalous positive polarity transient luminance annihilation, transferred charge being comprised of mainly relaxation charge, and a decrease in the 50 Hz threshold voltage with increasing temperature. Low temperature aging experiments suggest that aging is at least partially due to hot electron-induced degradation. Although most Zn2GeO4:Mn ACTFEL devices exhibit a moderate amount of aging, certain devices are found to exhibit no measurable aging at 1 kHz when aged for 24 hours.

Keywords

thin-film electroluminescent device, electroluminescence, oxide phosphor, Zn2GeO4

RIV year

2005

Released

29.04.2005

Publisher

VŠB-TU Ostrava

Location

Ostrava

ISBN

80-248-0774-2

Book

Proceedings of XXXth Seminary XXX ASR´ 05, Instruments and Control 2005

Pages from

10

Pages to

11

Pages count

2

BibTex


@inproceedings{BUT17775,
  author="Mustafa M. Abdalla {Ahmed}",
  title="Aging characteristics of green-emitting Zn2GeO4:Mn alternating-current thin-film electroluminescent devices",
  annote="Electrical, electro-optic, temperature, and aging characteristics of green-emittingZn2GeO4:Mn alternating-current thin-film electroluminescent (ACTFEL) devices are presented.
The Zn2GeO4:Mn phosphor layers are prepared by rf sputtering. A maximum luminous efficiency of 0.45 lm/W and luminance of 105 cd/m2 at 50 Hz and 40 V above threshold are obtained. Field-ionization of impact-excited Mn+2 luminescent impurities is found to give rise to positive space charge within the Zn2GeO4 phosphor, leading to unusual device behaviors such as conduction current delay, anomalous positive polarity transient luminance annihilation, transferred charge being comprised of mainly relaxation charge, and a decrease in the 50 Hz threshold voltage with increasing temperature. Low temperature aging experiments suggest that aging is at least partially due to hot electron-induced degradation. Although most Zn2GeO4:Mn ACTFEL devices exhibit a moderate amount of aging, certain devices are found to exhibit no measurable aging at 1 kHz when aged for 24 hours. 
",
  address="VŠB-TU Ostrava",
  booktitle="Proceedings of XXXth Seminary XXX ASR´ 05, Instruments and Control 2005",
  chapter="17775",
  institution="VŠB-TU Ostrava",
  year="2005",
  month="april",
  pages="10--11",
  publisher="VŠB-TU Ostrava",
  type="conference paper"
}