|Autors: Dobrikov, G. H., Aleksandrova, M. P., G. M. Dobrikov.|
Title: Thermally activated current for defect analysis in electroluminescent devices based on new synthesized low-molecular weight compound
Keywords: organic electroluminescence; screen printing, thermally activated current, OLED.
Abstract: This paper describes thermally activated current (TAC) of alternative current electroluminescent samples, consisting of new light – emissive organic compound 1,8-naphthalimide derivative 2-(6-hydroxyhexyl)-6-(pyrrolidin-1-yl)-1H-benzo[de]isoquinoline-1,3(2H)-dione). TAC is measured at supplied AC voltage of 47 V in emissive mode. The structures are prepared on glass substrate covered with RF sputtered indium-tin oxide (ITO). Electroluminescent material is deposited by screen printing on the ITO, followed by thermal evaporation of aluminum. The investigations are conducted in the temperature range from 6 oC to 50 oC at constant optimal frequency of 9 kHz. TAC spectra give information about the concentration of the discrete levels and the energy change in n-π* charge carriers transition. Voltage-brightness characteristic are measured and the quantum efficiency is calculated for the optimal frequency.
Вид: постер/презентация в международен форум