Ru 착화학물 기반의 전기화학발광 소자 내에서 PMMA 함유량에 의존하는 이온들의 이동현상에 관한 연구

Abstract

In this paper, we have investigated the effects of poly(methyl methacrylate) (PMMA), which is intentionally added to improve the printability and processability of ruthenium complex-based light-emitting layers, on the migration of ions in the emissive layer of the electrochemiluminescent (ECL) device. For this purpose, we fabricated the ECL devices with three different (ratios of 10:0.14, 10:1, and 10:3) solutions comprised in a 9:1 ratio mixture of ruthenium complex and ionic liquid dissolved in acetonitrile at a concentration of 20 mg/ml and a solution of PMMA dissolved in dichloromethane at a concentration of 25 mg/ml and evaluated the electrical characteristics of the devices. As a result, the driving voltage of the ruthenium complex-based ECL devices gradually increased as the PMMA contents in the layer increased. However, the hysteresis, that is the difference in the current flows under the forward and the reverse bias, was getting disappeared as the amount of PMMA decreased.