Organic electro phosphorescent device and its preparation method |
Title: |
Organic electro phosphorescent device and its preparation method |
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Application Number: |
200410069263 |
Application Date: |
2004/07/16 |
Announcement Date: |
2005/02/16 |
Pub. Date: |
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Publication Number: |
1582073 |
Announcement Number: |
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Grant Date: |
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Granted Pub. Date: |
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ApplicationType: |
Invention |
State/Country: |
11[China|beijing] |
IPC: |
C09K 11/06, H05B 33/10, H05B 33/12, H05B 33/14, H05B 33/20 |
Applicant(s): |
Tsinghua Univ. |
Inventor(s): |
Qiu Yong, Lei Gangtie, Wang Liduo |
Key Words: |
Organic, electro phosphorescent, device, preparation method |
Abstract: |
The present invention relates to an organic electro phosphorescent device and its preparation method. Said device comprises a transparent base sheet, an anode layer, organic functional layer and a cathode layer, wherein the organic functional layer comprises organic luminous layer and one ore more layers selected from a positive hole injection layer, a positive hole transport layer, an electronic transport layer and an electron injection layer, said organic luminous layer includes a body material and a phosphorescent coloring agent, the doping concentration of said phosphorescent coloring agent gradually rises or drops with the thickness increase of the organic luminous layer to form a gradient doping structure. For said device, by doping the phosphorescent coloring agent into the body material in the organic luminous layer with a gradient doping manner, the luminous area of the device is expanded and the use ratio of the phosphorescent coloring agent is improved; it is also helpful to the exciton formation from electronic and positive hole, then light-emitting efficiency and lighteness of the device are improved, and the stability is improved; at the same time, the shortcomings of low light-emitting efficiency and poor stability of the device under large electric current are overcome. |
Claim: |
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Priority: |
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