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Organic light-emitting diode equipment with improved operation stability

A technology of organic light-emitting devices and light-emitting layers, which is applied in the direction of light-emitting materials, electroluminescence light sources, organic semiconductor devices, etc., can solve the problems of low working stability and insufficient stability, and achieve outstanding luminous efficiency and color chroma, high Operational stability, long life effect

Inactive Publication Date: 2003-11-05
GLOBAL OLED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the use of doped emissive layers of various compositions has significantly improved EL efficiency, color, and stability, the problem of low operational stability still exists
Insufficient stability has become the biggest obstacle to many desired practical applications

Method used

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  • Organic light-emitting diode equipment with improved operation stability
  • Organic light-emitting diode equipment with improved operation stability
  • Organic light-emitting diode equipment with improved operation stability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2-6

[0152] OLED devices 2-6 were constructed similarly to Comparative Example 1, except that naphtho[2,3-a]pyrene was used as the first host material and AlQ was used as the second host material in the emissive layer (2). The relative content of naphtho[2,3-a]pyrene and AlQ based on volume is 1:99, 2:98, 4:96, 10:90 and 15 for Examples 2, 3, 4, 5 and 6, respectively. : 85. The EL characteristics of devices 2-6 are listed in Table I. As can be seen from Table I, devices 2-6 show that as the volume % of naphtho[2,3-a]pyrene increases: 1) the luminous efficiency decreases slightly and then increases; 2) the emission color shifts from green to yellow Green; 3) Variation of Δcd / A versus J from gain to larger loss then smaller loss; 4) 200-800% improvement in lifetime relative to control device 1 . Comparative Example 7

Embodiment 8-11

[0155] OLED devices 8-11 were constructed similarly to Comparative Example 7, except that the light-emitting layer was prepared using naphtho[2,3-a]pyrene as the first host material, AlQ as the second host material, and CFDMQA as the dopant . Naphthalene[2,3-a]pyrene, AlQ and CFDMQA are based on the relative content of volume ratio for embodiment 8,9,10 and 11 are respectively 1:98.5:0.5, 2:97.5:0.5,4:95.5:0.5 and 8:91.5:0.5. The EL characteristics of devices 8-11 are listed in Table I. As can be seen from Table I, devices 8-11 show that as the volume % of naphtho[2,3-a]pyrene increases: 1) the luminous efficiency drops by about 40%; 2) the emission color shifts from green to yellow-green 3) Change in Δcd / A versus J from gain to loss; 4) 240-550% improvement in lifetime over control device 7. Comparative Example 12

Embodiment 13-16

[0158] OLED devices 13-16 were constructed similarly to Comparative Example 12, except that the light-emitting layer was prepared using naphtho[2,3-a]pyrene as the first host material, AlQ as the second host material, and C545T as the dopant . Naphthalene[2,3-a]pyrene, AlQ and C545T are based on volume ratio relative content for embodiment 13,14,15 and 16 are respectively 1:98.5:0.5,2:97.5:0.5,4:95.5:0.5 and 8:91.5:0.5. The EL characteristics of devices 13-16 are listed in Table I. As can be seen from Table I, devices 13-16 show that as the volume % of naphtho[2,3-a]pyrene increases: 1) the luminous efficiency drops by about 45%; 2) there is no significant shift in the emission color; 3 ) change in Δcd / A vs. J from no loss to loss; 4) 340-1000% improvement in lifetime over control device 12 . also measured at 20mA / cm 2 and T under RT 50％ : Example 12 is 1600h and Example 16 is 14200h.

[0159] Example

[0160]OLED device 17 was constructed similarly to Comparat...

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Abstract

An organic light-emitting device comprising a substrate, an anode and a cathode deposited on the substrate, and a light-emitting layer deposited between the anode and the cathode, wherein the light-emitting layer comprises a host and at least one dopant, the selected The light-emitting layer host comprises a solid organic material containing a mixture of at least two components, one of which is capable of forming both monomeric and aggregated states.

Description

technical field [0001] The present invention relates to organic light emitting diode devices, and more particularly to the design of organic layer compositions for improved operational stability. Background technique [0002] An organic light emitting diode (OLED), also known as an organic electroluminescent (EL) device, is an electronic device that emits light in response to an electric current applied to the device. The structure of an OLED device generally includes an anode, an organic EL medium and a cathode. The term "organic EL medium" refers here to the organic material or layer of organic material deposited between the anode and cathode in an OLED device. The organic EL medium may include low-molecular-weight compounds, high-molecular-weight compounds, oligomers of low-molecular-weight compounds, or biomaterials in the form of thin films or bulk solids. The medium can be amorphous or crystalline. Organic electroluminescent media of various ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06H01L51/00H01L51/30H01L51/50
CPCC09K11/06C09K2211/1003C09K2211/1011Y10S428/917H10K85/623H10K85/624H10K85/653H10K85/656H10K85/622H10K85/654H10K85/657H10K85/324H10K50/11H10K2101/90H05B33/18B82Y20/00
Inventor V·V·亚里科夫
Owner GLOBAL OLED TECH
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