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White light organic electroluminescent device

A technology of electroluminescent devices and phosphorescent luminescent materials, applied in the direction of electric solid devices, electrical components, semiconductor devices, etc., can solve the problems of short service life of blue materials, low device efficiency, complicated manufacturing, etc., and achieve high luminous efficiency and improved Stability, the effect of increasing the selection range

Inactive Publication Date: 2007-02-28
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fabrication of such microdevices is complex and requires specialized operator skills and is inefficient
Jou (Jwo-Huei Jou, et al, APL 87, 043408 (2005)) reported a red, green and blue phosphorescent material (Firpic, Ir(ppy) 3 , Btp 2 A method of doping Ir(acac)) into PVK polymer host material to prepare white light devices, but the blue material in the device has a short lifetime
Although encouraging approaches have achieved improvements in white OLEDs, the efficiencies of these devices are still low, and thus device structure improvements are still needed to obtain organic electroluminescent devices with high efficiency and color coordinates close to ideal white light.

Method used

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specific Embodiment approach 1

[0047] As shown in FIG. 5 , the organic functional layer 3 includes a hole injection layer 31 , a light emitting layer 34 , a hole blocking layer 35 , and an electron transport layer 36 , and the light emitting layer 34 includes a blue fluorescent light emitting layer 341 and a phosphorescent light emitting layer 342 . The hole injection layer 31 is made of CuPc. The material of the blue fluorescent emitting layer 341 is NPB. The phosphorescent light-emitting layer 342 emits yellow phosphorescence, and the material adopts (t-bt) 2 Ir(acac). The carrier material in the light emitting layer 34 is CBP. The material of the hole blocking layer 35 is BCP. The electron transport layer 36 material is Alq 3 . Transparent substrate 1 is made of glass. The material of the anode layer 2 is ITO. Cathode layer 4 is made of LiF thin layer and metal Al. The whole device structure can be described as:

[0048] Glass / ITO / CuPc / CBP:NPB / CBP:(t-bt) 2 Ir(acac) / BCP / Alq 3 / LiF / Al,

[0049]...

specific Embodiment approach 2

[0061] As shown in FIG. 6 , the organic functional layer 3 includes a hole injection layer 31 , a light emitting layer 34 , and an electron transport layer 36 , and the light emitting layer 34 includes a blue fluorescent light emitting layer 341 and a phosphorescent light emitting layer 342 . The hole injection layer 31 is made of CuPc. The material of the blue fluorescent emitting layer 341 is DPVBi. The phosphorescence emitting layer 342 emits red phosphorescence, and the material adopts (btp) 2 Ir(acac). The carrier material in the light emitting layer 34 is CDBP. The electron transport layer 36 material is Alq 3 . Transparent substrate 1 is made of glass. The material of the anode layer 2 is ITO. The cathode layer 4 is made of an alloy of Mg and Ag. The whole device structure can be described as:

[0062] Glass / ITO / CuPc / DPVBi / CDBP:(btp) 2 Ir(acac) / Alq 3 / Mg:Ag,

[0063] or

[0064] Glass / ITO / CuPc / CDBP:(btp) 2 Ir(acac) / CDBP:DPVBi / Alq 3 / Mg:Ag.

[0065] The fa...

specific Embodiment approach 3

[0066] As shown in Figure 7, the organic functional layer 3 includes a hole injection layer 31, a light emitting layer 34, an electron transport layer 36 and a hole blocking layer 37, and the light emitting layer 34 includes a blue fluorescent light emitting layer 341, a red phosphorescent light emitting layer 343 and A green phosphorescence emitting layer 344 . The hole injection layer 31 is made of CuPc. The material of the blue fluorescent emitting layer 341 is NPB. Red phosphorescent light-emitting layer 343 material used (btp) 2 Ir(acac). The material of the green phosphorescence emitting layer 344 is Ir(ppy) 3 . The carrier material in the light emitting layer 34 is CBP. The material of the electron transport layer 36 is BCP. The hole blocking layer 37 is made of BCP. Transparent substrate 1 is made of glass. The material of the anode layer 2 is ITO. Cathode layer 4 is made of LiF thin layer and metal Al. The whole device structure can be described as:

[0067...

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Abstract

The invention relates to a white light organic electroluminescent device. Wherein, it comprises transparent liner 1, anode layer 2, organic function layer 3, and cathode layer 4; the organic function layer 3 at least comprises lighting layer 34 formed by carrier material, blue fluorescent material and phosphorescent material; driven by external power 90, the device can light white color; the lighting layer 34 has single layer, dual-layer or multilayer structure; the organic function layer 3 also can comprises one or several of cavity pour layer 31, cavity transmission layer 32, electron baffle layer 33, cavity baffle layer 35, electro transmission layer 36, and electro pour layer 37. The invention combines the blue fluorescent material and phosphorescent material to improve the lighting efficiency, with adjustable color coordinate and improved stability. The invention can be used in the back light of color liquid crystal display.

Description

technical field [0001] The invention belongs to the technical field of electronic components and relates to an organic electroluminescent display device emitting white light. Background technique [0002] With the development of multimedia technology and the advent of the information society, people have higher and higher requirements for the performance of flat panel displays. Three new types of displays that have emerged in recent years: plasma displays, field emission displays, and organic electroluminescent displays, all make up for the shortcomings of CRT displays and liquid crystal displays to a certain extent. Among them, the organic electroluminescent display has a series of advantages such as self-illumination, low-voltage DC drive, full curing, wide viewing angle, and rich colors. Low, its response speed can reach 1000 times that of liquid crystal display, but its manufacturing cost is lower than the liquid crystal display of the same resolution, therefore, organi...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54
Inventor 王军蒋亚东于军胜
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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