Organic single-quantum-well electroluminescent device

A new kind of single-quantum-well electroluminescent (EL) device consists o f a hole transport N,N-Bis(3-methyphenyl)-N,N-diphenylbenzidine(TPD) layer, and electron transport 8-(quinolinolate)-aluminum(Alq) layer and a light e mitting layer of Alq doped with 5,6,11,12-tetraphenylnaphthacene (rubrene) has been fabricated by the multisource-type high-vaccum organic molecular d eposition. The dopant rubrene is as a potential well, and the undoped Alq l ayer is as a barrier layer. The EL spectra shows the spectral narrowing and the emission peak energy blue-shift, and the efficiency and luminance of t he device have been significantly improved. The experimental phenomena is e xplained as the result of recombination of carriers from the quantized ener gy state.