Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2006-09-26
2006-09-26
Koslow, C. Melissa (Department: 1755)
Stock material or miscellaneous articles
Composite
Of inorganic material
C348S333010
Reexamination Certificate
active
07112374
ABSTRACT:
By repeating a purification process of a light-emitting organic compound several times, a thin film made of the light-emitting organic compound to be used in an EL display device contains ionic impurities at the concentration of 0.1 ppm or lower and has a volume resistivity in the range of 3×1010Ωcm or larger. By using such a thin film as a light-emitting layer in the EL device, a current caused by reasons other than the carrier recombination can be prevented from flowing through the thin film, and deterioration caused by unnecessary heat generation can be suppressed. Accordingly, it is possible to obtain an EL display device with high reliability.
REFERENCES:
patent: 5104749 (1992-04-01), Sato et al.
patent: 5247190 (1993-09-01), Friend et al.
patent: 5399502 (1995-03-01), Friend et al.
patent: 5420288 (1995-05-01), Ohta et al.
patent: 5558904 (1996-09-01), Hsieh et al.
patent: 5597925 (1997-01-01), Ohta et al.
patent: 5610309 (1997-03-01), Ohta et al.
patent: 5656401 (1997-08-01), Ohta et al.
patent: 5684365 (1997-11-01), Tang et al.
patent: 5909038 (1999-06-01), Hwang et al.
patent: 6114183 (2000-09-01), Hamada et al.
patent: 6117965 (2000-09-01), Hwang et al.
patent: 6147451 (2000-11-01), Shibata et al.
patent: 6201343 (2001-03-01), Spindt et al.
patent: 6300612 (2001-10-01), Yu
patent: 6312837 (2001-11-01), Kijima
patent: 6617051 (2003-09-01), Higashi et al.
patent: 6641933 (2003-11-01), Yamazaki et al.
patent: 6661454 (2003-12-01), Hwang et al.
patent: 0 399 508 (1990-11-01), None
patent: 2-311591 (1990-12-01), None
patent: 10-92576 (1998-04-01), None
patent: 11-171801 (1999-06-01), None
patent: WO90/13148 (1990-11-01), None
Zou et al, “Study on the degradation mechanism of organic light-emitting diodes (OLEDs)”, Synthetic Metals 91 (1997), pp. 191 93.
H. Shenk et al., “Polymers for Light Emitting Diodes,” Euro Display Proceedings 1999, pp. 33-37.
European Search Report for EP 00 12 0773 dated Mar. 1, 2005.
T. Tsutsui et al.,Effect of Impurity Ions and Permanent Dipoles for Device Performance of Thin-Film Electroluminescent Diodes, Material Research Society Symposia Proceedings, vol. 488, pp. 611-616, 1998.
Konuma Toshimitsu
Mizukami Mayumi
Yamazaki Shunpei
Koslow C. Melissa
Robinson Eric J.
Robinson Intellectual Property Law Office P.C.
Semiconductor Energy Laboratory Co,. Ltd.
LandOfFree
EL display device utilizing light-emitting organic compounds... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with EL display device utilizing light-emitting organic compounds..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and EL display device utilizing light-emitting organic compounds... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3619311