Abstract: A tandem OLED includes an anode and a cathode. The OLED also includes at least two electroluminescent units disposed between the anode and the cathode, wherein each of the electroluminescent units includes at least one hole-transporting layer and one organic light-emitting layer. An intermediate connector is disposed between adjacent electroluminescent units, wherein the intermediate connector includes an n-doped organic layer and an electron-accepting layer, the electron-accepting layer being disposed closer to the cathode than the n-doped organic layer, and wherein the electron-accepting layer includes one or more organic materials, each having a reduction potential greater than ?0.5 V vs. a Saturated Calomel Electrode, and wherein the one or more organic materials constitute more than 50% by volume of the electron-accepting layer.
Type:
Grant
Filed:
February 23, 2005
Date of Patent:
February 24, 2009
Assignee:
Eastman Kodak Company
Inventors:
Liang-Sheng Liao, Wojciech K. Slusarek, Tukaram K. Hatwar, Michele L. Ricks, Dustin L. Comfort
Abstract: The present invention is related to a luminescent material generated by polymerization of a pyrromethene complex by glow discharge. The polymer material of the present invention exhibits semi-conductive properties and has a luminescence maximum in a spectrum region in the range of about 540 nm to about 585 nm with a half-width of the luminescence band in the range of about 55 nm to about 75 nm, a quantum yield of photoluminescence in the range of about 0.6 to about 0.8, and an electric conductivity at a temperature of about 20° C. in the range of about 1×10?10 S/cm to about 5×10?10 S/cm. The resultant polymer layer has a thickness in the range of about 0.01 ?m to about 10 ?m on a substrate placed between or on any of the electrodes. The starting pyrromethene complex may be a 1,3,5,7,8-pentamethyl-2,6-diethylpyrromethene difluoroborate complex (pyrromethene 567).
Type:
Grant
Filed:
December 30, 2004
Date of Patent:
November 18, 2008
Assignee:
Samsung Electronics Co., Ltd.
Inventors:
Alexandr Ivanovich Drachev, Alla Borisovna Gilman, Alexandr Alexeevich Kuznetsov, Nikolay Mikhaylovich Surin
Abstract: An organic electroluminescent device including an organic green emission layer comprising a green emission material and a blue emission material. The green emission layer is interposed between a pair of electrodes.
Type:
Grant
Filed:
July 26, 2005
Date of Patent:
November 4, 2008
Assignee:
Samsung SDI Co., Ltd.
Inventors:
Hye-In Jeong, Ok-Keun Song, Young-Mo Koo, Yong-Han Lee