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Organic electroluminescence device

An electroluminescent device and luminescence technology, which is applied in the direction of electric solid-state devices, electrical components, organic dyes, etc., can solve problems such as poor chromaticity, poor color stability, and low blue light luminous efficiency, and achieve an increase in working life , The effect of compound area expansion

Inactive Publication Date: 2010-04-14
KUNSHAN VISIONOX DISPLAY TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the bandgap of blue light-emitting materials is relatively wide and the efficiency of blue light emission is relatively low, the lifespan of blue light devices and blue light-emitting layers is still a bottleneck problem restricting the performance of OLEDs.
[0004] White OLED also has some technical difficulties, such as: the luminous efficiency of the device is not high enough, the chromaticity is not good at low voltage, and the color stability is not good when the external driving voltage changes.

Method used

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  • Organic electroluminescence device
  • Organic electroluminescence device
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1 is a kind of blue OLED, and device structure is as follows:

[0047] ITO / NPB / BH 1 :NPB:BD 1 / BH 1 :BD 2 / Alq 3 / LiF / Al

[0048] like figure 1 As shown, the light-emitting layer 05 is a composite blue light-emitting layer, including blue light-emitting layer 1 (051) and blue light-emitting layer 2 (052). The blue light-emitting layer 1 is formed by mixing two host materials and doping blue light dyes, one of which is an electron-transporting material BH 1 , the other main body is the material N, N'-diphenyl N, N'-(1-naphthyl)-1,1'-biphenyl-4,4'-diamine (hereinafter referred to as NPB ), the doped blue light dye is shown in formula (10) (referred to as BD 1 ):

[0049]

[0050] The blue light-emitting layer 2 is formed by doping a blue light dye with a single host material, and the host is BH with electron transport properties. 1 , the doped blue light dye is shown in formula (5) (referred to as BD 2 ):

[0051]

[0052] The method for prepa...

Embodiment 2～ Embodiment 4

[0060] The device structures and preparation methods of Examples 2 to 4 are basically the same as those of Examples, the difference being that the weight percentages of blue light dye doping in the blue light-emitting layer 2 of Examples 2 to 4 are respectively 3%, 6%, the device performance of 10% above-mentioned embodiment 1~4 is as shown in table 2:

[0061] Table 2

[0062]

[0063] As can be seen from the device performance data in the foregoing embodiments, BD 1 and BD 2 Two kinds of dyes ensure the device has high luminous efficiency. At the same time, through the sky blue dye BD 2 As the doping concentration increases, the color coordinates of the device change in the range of (0.14, 0.22) to (0.15, 0.29), and the color appears blue from deep to light. Therefore, by adjusting the doping concentration of one of the dyes, the chromaticity of the device can be adjusted more easily.

Embodiment 5

[0065] Embodiment 5 is a white OLED with double light-emitting centers, and the device structure is as follows:

[0066] ITO / NPB / NPB:rubrene / BH 1 :NPB:BD 1 / BH 1 :BD 2 / Alq 3 / LiF / Al

[0067] like figure 2 As shown, the light-emitting layer 05 respectively includes a yellow light-emitting layer 053, a blue light-emitting layer 1 (054), and a blue light-emitting layer 2 (055), wherein the yellow light-emitting layer is doped with a yellow dye 5 using NPB, a host material with hole transport properties, 6,11,12-Tetraphenyltetracene (rubrene for short).

[0068] The blue light-emitting layer 1 is formed by mixing two host materials and doping a blue dye, one of which is an electron-transporting material BH 1 , the other host is NPB, and the doped blue dye is shown in formula (10) (referred to as BD 1 ), BD 1 in BH 1 The weight percentage of doping in is 5%:

[0069]

[0070] The blue light-emitting layer 2 is formed by doping a blue dye with a single host material,...

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Abstract

The invention relates to an organic electroluminescence device, in particular to a luminous layer structure of an organic white light emitting device. In the invention, in order to obtain a device with high efficiency, long service life and good color compatibility, particularly a white device, a compound luminous layer structure is adopted, and two different dyes are respectively doped; and the color of the device can be easily adjusted by adjusting the doping concentration of one dye so as to meet different color requirements, which is especially important for the white device.

Description

technical field [0001] The invention relates to an organic electroluminescent device, in particular to a light-emitting layer structure of an organic electroluminescent device. Background technique [0002] Organic Light Emitting Diode (hereinafter referred to as OLED) has attracted widespread attention due to its advantages of thin body, large area, full curing, and flexibility. It has become a hotspot of research due to its huge potential. [0003] The high efficiency, high brightness and high color stability of OLED are of great significance to its industrialization. The light-emitting layer of OLED generally adopts small molecular materials, which can be fluorescent materials, such as metal-organic complexes (such as Alq 3 、Gaq 3 , Al(Saph-q) or Ga(Saph-q)) compounds, the small molecule material can be doped with dye, the doping concentration is 0.01wt% to 20wt% of the small molecule material, and the dye is generally an aromatic condensed ring One of the materials i...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54H01L51/56
CPCC09B57/008C09B57/00C09B1/00C09B57/001C09B57/10C09B23/148
Inventor 邱勇吴空物
Owner KUNSHAN VISIONOX DISPLAY TECH
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