<title>Polymer light-emitting diodes of poly(m-phenylene-thiophene) derivative and tris(8-hydroxyquinoline) aluminum heterostructure</title>

Abstract

Multicolored electroluminescent (EL) devices has been realized utilizing poly((1-dodecyloxy-4-methyl-1,3- phenylene)(2,5-terthienylene)) (mPTTh) as an emitting layer and tris(8-hydroxyquinoline) aluminum (Alq3) as an electron transport layer. A single layer EL device of mPTTh polymer emits orange-colored light. EL intensity increase as the thickness of Alq3 layer increases up to 30 nm, but the emission color becomes diversified when the Alq3 layer thickness is greater than 30 nm since the relative peak intensity of green EL from Alq3 layer grows. EL color is changed form orange to greenish orange depending on the thickness of Alq3 layer. EL efficiency of the double layer device was greatly enhanced by 3000 times in compared to that of single layer device. Alq3 layer in device acts as a hole blocking electron transporting layer and an emitting layer as a function of the thickness of Alq3 layer.© (1997) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.