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White light organic electroluminescent device and manufacturing method thereof

An electroluminescent device, an organic technology, applied in the direction of electric solid-state devices, chemical instruments and methods, semiconductor/solid-state device manufacturing, etc., to achieve the effects of improving efficiency, broadening the exciton recombination area, and eliminating non-radiative recombination energy loss

Inactive Publication Date: 2011-10-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, in the published research work, the work that can simultaneously address these two constraints is rarely reported

Method used

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  • White light organic electroluminescent device and manufacturing method thereof
  • White light organic electroluminescent device and manufacturing method thereof
  • White light organic electroluminescent device and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Such as figure 2 As shown, the material of the hole transport and exciton blocking layer 31 of the device is TAPC, the blue phosphorescent light emitting layer 32 selects the blue phosphorescent material Firpic doped with mCP, the spacer layer 33 selects the wide bandgap hole transport type material mCP, and the complementary phosphorescence The light-emitting layer 34 selects yellow phosphorescent dye (t-bt) 2 Ir(acac) doped BPhen, the electron transport layer 35 is made of BPhen, and the cathode layer 4 is made of Mg:Ag alloy and Ag. The entire device structure is described as:

[0059] Glass / ITO / TAPC(30nm) / mCP:Firpic(20nm) / mCP(5nm) / BPhen:(t-bt) 2 Ir(acac)(15nm) / BPhen(40nm) / Mg:Ag(200nm) / Ag(10nm)

[0060] The preparation method is as follows:

[0061] ①Use detergent, deionized water, acetone solution and ethanol solution to ultrasonically clean the glass substrate and the transparent conductive film ITO on it, and dry it with high-purity nitrogen after cleaning. ...

Embodiment 2

[0068] Such as figure 2 As shown, the material of the hole transport and exciton blocking layer 31 of the device is TAPC, the blue phosphorescent light emitting layer 32 selects the blue phosphorescent material Firpic doped with mCP, the spacer layer 33 selects the wide bandgap hole transport type material mCP, and the complementary phosphorescence The light-emitting layer 34 selects green phosphorescent dye (tpbi) 2 Ir(acac) doped BPhen, the electron transport layer 35 is made of BPhen, and the cathode layer 4 is made of Mg:Ag alloy and Ag. The entire device structure is described as:

[0069] Glass / ITO / TAPC(30nm) / mCP:Firpic(20nm) / mCP(5nm) / BPhen:(tpbi) 2 Ir(acac)(15nm) / BPhen(40nm) / Mg:Ag(200nm) / Ag(10nm)

[0070] The fabrication process of the device is similar to that of Example 1.

Embodiment 3

[0072] Such as figure 2 As shown, the material of the hole transport and exciton blocking layer 31 of the device is TAPC, the blue phosphorescent light-emitting layer 32 selects the blue phosphorescent material FIr6 doped with mCP, the spacer layer 33 selects the wide bandgap hole transport type material mCP, and the complementary phosphorescence The light-emitting layer 34 selects yellow phosphorescent dye (t-bt) 2 Ir(acac) doped BPhen, the electron transport layer 35 is made of BPhen, and the cathode layer 4 is made of Mg:Ag alloy and Ag. The entire device structure is described as:

[0073] Glass / ITO / TAPC(30nm) / mCP:FIr6(20nm) / mCP(5nm) / BPhen:(t-bt) 2 Ir(acac)(15nm) / BPhen(40nm) / Mg:Ag(200nm) / Ag(10nm)

[0074] The fabrication process of the device is similar to that of Example 1.

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Abstract

The invention discloses a white light organic electroluminescent device which comprises a substrate, an anode layer, a cathode layer and an organic functional layer which is arranged between the anode layer and a cathode layer; the organic functional layer comprises a hole injection layer, a hole transmission and exciton blocking layer, a blue phosphorescence luminescent layer, a spacing layer, acomplementary phosphorescence luminescent layer and an electronic transmission layer; and the triplet state energy level of the hole transmission and exciton blocking layer is not less than that of the main material in the blue phosphorescence luminescent layer, the lowest unoccupied molecular orbit energy level of the spacing layer is higher than that of a blue phosphorescence luminescent material, and the triplet state energy level of the spacing layer is not less than that of the main material in a blue light emitting layer. By using the device, defects in the prior art are overcome, the performances and color stability under high current density of the device are improved, an efficient, stable and phosphorescence white light device is obtained, the cost of raw materials is lowered, and the device is more suitable for industrial production in large scale.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescent devices, in particular to a white light organic electroluminescent device and a preparation method thereof. Background technique [0002] As a solid light source, white organic electroluminescent devices have attracted people's attention in the fields of display and lighting due to their advantages such as simple preparation process, low production cost, large-area light emission, ultra-thin, bendable, wide range of material sources, and environmental protection. After more than 20 years of development, the performance and theoretical research of organic electroluminescent devices have made great progress. The technology of various monochromatic light-emitting devices is becoming more and more mature, the performance of the devices has been continuously improved, and commercial products have come out. Due to the increasing demand for organic electroluminescence full-color displ...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/52H01L51/54H01L51/56C09K11/06
CPCY02B20/00
Inventor 蒋亚东于军胜雷霞赵萌
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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