Patent ID: 7211948
Filing Date: 2007-05-01
Classification: H01L,H05B

Abstract:
1. An organic electroluminescent device, comprising: a) an anode; b) a hole-transporting layer disposed over the anode; c) a light-emitting layer disposed over the hole-transporting layer for producing light in response to hole-electron recombination; d) an electron-transporting layer disposed over the light-emitting layer; e) a crystallization-inhibitor incorporated within the electron-transporting layer and wherein when the crystallization-inhibitor is an anthracene derivative, the concentration of the anthracene derivative is in the range greater than 25 percent by volume up to 50 percent by volume of the electron-transporting layer, wherein the crystallization-inhibitor prevents the electron-transporting layer from crystallizing during operation; and f) a cathode disposed over the electron-transporting layer.