Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1997-03-05
1999-10-05
Patel, Nimeshkumar D.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313509, 313512, 313498, 445 38, 445 43, 445 44, 445 53, H05B 3304
Patent
active
059629622
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of encapsulating an organic electroluminescence device ("electroluminescence" to be referred to as "EL" hereinafter) and an encapsulated organic electroluminescence device (to be referred to as "encapsulateded EL device" hereinafter).
TECHNICAL BACKGROUND
An EL device has high visibility owing to self-emission of light, and has excellent impact resistance owing to a complete solid device. Due to these characteristics, there have been proposed a variety of inorganic EL devices for which inorganic compounds are adapted as a light-emitting material and a variety of organic EL devices for which organic compounds are adapted as a light-emitting material. Above all, developments of organic EL devices are actively underway for obtaining organic EL devices having higher performance, since the organic EL devices permit a decrease in drive voltage to a great extent as compared with inorganic EL devices.
In the basic constitution of an organic EL device, the organic EL device has a structure in which an anode, a light-emitting layer and a cathode are consecutively laminated, and the above organic EL device is formed on a substrate in many cases. The anode and the cathode may be reversed in position. In some cases, further, a hole-transporting layer is provided between the anode and the light-emitting layer, and an electron-injecting layer is provided between the cathode and the light-emitting layer, for improving the performance. The light-emitting layer is generally formed of one or a plurality of organic light-emitting materials, while it is sometimes formed of a mixture of an organic light-emitting material with a hole-transporting material and/or an electron-injecting material.
Further, in a pair of electrodes (anode and cathode) constituting the organic EL device, the electrode positioned on a surface through which light comes out is formed of a transparent or semi-transparent film for improving the light emission efficiency and due to a constitution as a surface light-emitting device. The other electrode (to be sometimes referred to as "opposite electrode" hereinafter) positioned opposite to the surface through which light comes out is formed of a specific metal thin film (thin film of metal, alloy or a mixture of metals).
The organic EL device having the above constitution is a current-driven light-emitting device, and it is required to apply a high electric current between the anode and the cathode for performing light emission. As a result, the device generates heat when the device is emitted, and when the device has oxygen or water around it, the oxygen and the water promote the oxidation of materials forming the device to degrade the device. In the typical degradation of the device by the oxidation and water, a dark spot occurs and grows. The dark spot refers to a fault point of light emission. As the oxidation of the materials forming the device proceeds with the driving of the organic EL device, the existing dark spot grows, and eventually, the dark spot spreads over the entirety of the light-emitting surface.
For preventing the above degradation, a variety of methods have been hitherto proposed. For example, for effectively removing heat which the device generates when the device is emitted, JP-A-4-363890 discloses a method in which an organic EL device is held in an inert liquid compound of liquid fluorinated carbon. As a method of removing water which is one of those which cause the degradation, JP-A-5-41281 discloses a method in which an organic EL device is held in an inert liquid compound prepared by incorporating a dehydrating agent such as synthetic zeolite into liquid fluorinated carbon (specifically, the same as the liquid fluorinated carbon disclosed in the above JP-A-4-363890). Further, JP-A-5-114486 discloses a method in which a heat-radiating layer encapsulating a fluorocarbon oil (specifically, included in the liquid fluorinated carbon disclosed in the above JP-A-4-363890) is formed on at least one of the anode and the cathode a
REFERENCES:
patent: 4446399 (1984-05-01), Endo et al.
patent: 4810931 (1989-03-01), McKenna et al.
Fujita Masato
Fukuoka Kenichi
Idemitsu Kosan Co. Ltd.
Patel Nimeshkumar D.
LandOfFree
Method of encapsulating organic electroluminescence device and o does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of encapsulating organic electroluminescence device and o, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of encapsulating organic electroluminescence device and o will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1175137