Organic white light electroluminescent devices

White Light emission is very important for applying electroluminescent devices to full display, backlight and illumination light source. In this letter, we have reported the white light devices with two sorts of structures. One is organic multi-quantum-well structure. The white light emission spectrum covers a wide range of the visible region, and the Commission Internationale de l'E clairage (C.I.E) co-ordinates of the emitted light are (0.32, 0.38) at 9 V. The maximum brightness and luminous efficiency of this device are 4000 cd/m(2) and 0.4 1 m\W, respectively. The other is multilayer structure. The turn on voltage is as low as 2.5 V. The C.I.E co-ordinates of the emitted Light are (0.319, 0.332) at 10 V. Bright white light, over 20 000 cd/m(2), was successfully obtained at about 18 V, and the maximum efficiency reaches to 1.11 im/W at 9 v. (C) 2000 Published by Elsevier Science S.A.