Detail publikace

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

AHMED, M.

Originální název

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

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

angličtina

Originální abstrakt

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.

Klíčová slova

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

Autoři

AHMED, M.

Rok RIV

2005

Vydáno

29. 4. 2005

Nakladatel

VŠB-TU Ostrava

Místo

Ostrava

ISBN

80-248-0774-2

Kniha

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

Strany od

10

Strany do

11

Strany počet

2

BibTex

@inproceedings{BUT17775,
  author="Mustafa M. Abdalla {Ahmed}",
  title="Aging characteristics of green-emitting Zn2GeO4:Mn alternating-current thin-film electroluminescent devices",
  booktitle="Proceedings of XXXth Seminary XXX ASR´ 05, Instruments and Control 2005",
  year="2005",
  pages="10--11",
  publisher="VŠB-TU Ostrava",
  address="Ostrava",
  isbn="80-248-0774-2"
}