LEE, YH KIM, DH JU, BK SONG, MH HAHN, TS CHOH, SH OH, MH 2024-01-21T20:35:11Z 2024-01-21T20:35:11Z 2022-01-10 1995-09-15 0021-8979 https://pubs.kist.re.kr/handle/201004/144990 We observed a decrease of the number of effective emission centers Mn2+ in the aged ZnS:Mn electroluminescence (EL) devices compared to the fresh EL devices using the electron-paramagnetic-resonance technique. Such phenomena can take place during the operation of the EL device, since the isolated Mn can easily diffuse into another site and forming cluster. Another possible explanation is that Mn2+ changes into Mn1+ or Mn3+ by transferring the electronic charge of the isolated Mn2+ to the neighboring Mn ions via sulfur and/or sulfur vacancy. As a result, luminance is lowered due to the decrease in the number of efficient emission centers of isolated Mn2+. (C) 1995 American Institute of Physics. English AMER INST PHYSICS ZN1-XMNXS DECREASE OF THE NUMBER OF THE ISOLATED EMISSION CENTER MN2+ IN AN AGED ZNS-MN ELECTROLUMINESCENT DEVICE Article 10.1063/1.359887 1 JOURNAL OF APPLIED PHYSICS, v.78, no.6, pp.4253 - 4257 JOURNAL OF APPLIED PHYSICS 78 6 4253 4257 scie scopus A1995RU95300102 2-s2.0-0012148299 Physics, Applied Physics Article ZN1-XMNXS