A hybrid organic light-emitting device (HOLED) was fabricated with a molecularly doped polyimide (MDPI) thin film and a tris(8-hydroxyquinolinato) aluminum thin film doped with zinc 5,10,15,20-tetraphenyl-21H,23H-porphyrin molecules as a hole injecting and transporting layer (HITL) and a red emission layer, respectively. Prior to the fabrication of the HOLED, the optical and thermal properties of the organic materials or thin films were investigated. The optical band gap of the MDPI thin film was similar to3.1 eV while the surface roughness was 9.3 Angstrom. The HOLED showed a real red electroluminescence with a spectral maximum at similar to1.97 eV. The luminance and the power efficiency reached approximately 500 cd/m(2) and 0.8 cd/A, respectively. It is theoretically expected that the HOLED is stable up to similar to160 degreesC. (C) 2003 Elsevier Ltd. All rights reserved.