We demonstrate mechanically flexible, organic light-emitting devices (OLED’s) based on the nonpolymetric thin-film materials tris-(8-hydroxyquinoline) aluminum (Alq3) and N, N′ -diphenyl- N, N′ -bis(3-methylphenyl)1- 1′ biphenyl-4, 4′ diamine (TPD). The single heterostructure is vacuum deposited upon a transparent, lightweight, thin plastic substrate precoated with a transparent, conducting indium tin oxide thin film. The flexible OLED performance is comparable with that of conventional OLED’s deposited upon glass substrates and does not deteriorate after repeated bending. The large-area (~1 - cm>2) devices can be bent without failure even after a permanent fold occurs if they are on the convex substrate surface or over a bend radius of ~0.5>cm if they are on the concave surface. Such devices are useful for ultralightweight, flexible, and comfortable full-color flat panel displays.
© 1997 Optical Society of America
G. Gu, P. E. Burrows, S. Venkatesh, S. R. Forrest, and M. E. Thompson, "Vacuum-deposited, nonpolymeric flexible organic light-emitting devices," Opt. Lett. 22, 172-174 (1997)