Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1997-07-11
2000-04-11
Nold, Charles
Stock material or miscellaneous articles
Composite
Of inorganic material
428691, 428917, 313504, 548224, 548101, H05B 3314
Patent
active
060486317
ABSTRACT:
An object of this invention is to provide an organic EL device material stable against heat, having a high purity in bluish light emission and a high efficiency. The organic EL device comprises a glass substrate, a transparent anode, a TPD which is an electron hole implanted transporting layer, an organic luminous layer, Alq.sub.3 which is an electron implanted transporting layer and a cathode. The organic luminous layer is an aluminum complex which is .mu.-oxozi [bis(2-(2-benzo oxazolyl)-phenolate) aluminum (III)]. Plus and minus DC voltages are applied to the anode and cathode respectively. The organic luminous layer indicates bluish light emission of 1314 cd/m.sup.2 at 16V. A peak wave length of the luminous spectrum is 420 nm and chromaticity coordinates are x=0.185 and y=0.178 and a high purity as bluish color is assured. The organic EL device material is stable against heat and difficult to deteriorate. Because the device structure is three-layer structure in which the organic luminous layer is sandwiched by an electron implanted transporting layer and an electron hole implanted transporting layer, diffusion of exciton to electrodes is prevented thereby improving the efficiency and reactive current is reduced thereby improving the service life.
REFERENCES:
patent: 5151629 (1992-09-01), VanSlyke
patent: 5484922 (1996-01-01), Moore et al.
patent: 5552547 (1996-09-01), Shi
patent: 5747183 (1998-05-01), Shi et al.
08/864,374 May 28, 1997, Pending.
08/893,757 Jul. 11, 1997, Pending.
"The Development of Chelate Metal Complexes as an Organic Electroluminescent Material" by Yuji Hamada in IEEE Transactions on Electron Devices vol. 44, No. 8, pp. 1208-1217, Aug. 1997.
"Recent Developments in Molecular Organic Electroluminescent Materials" by C.H. Chen et al in Macromol. Symp. vol. 125, pp. 17-19, 1997.
Miyauchi Toshio
Takahashi Hisamitsu
Tanaka Satoshi
Tsuruoka Yoshihisa
Futaba Denshi Kogyo K.K.
Nold Charles
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