ac anddc electroluminescence in CaS:Cu, Sm phosphors

A study of the electroluminescence mechanism in a light-emitting composite produced with PEDOT:PSS, PVA and Zn2SiO4:Mn

“…DCTFEL devices are produced with similar architecture but without the dielectric layers, thus the charge carriers are conducted directly into the light-emitting layer. In these type of device, the operational mechanism consists of three steps: (i) charge transport in the light-emitting material 2 , where i represents the electric current and V the excitation voltage [10][11][12]; (ii) impact excitation of light-emitting centres; (iii) radiative decay of excited electron in the light-emitting centre. In general, as a consequence of impact excitation [13][14][15], ACTFEL and DCTFEL devices exhibit turn-on electric fields of 10 5 -10 6 V/cm [16][17][18][19][20][21].…”