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Full-fluorescence type white light organic light emitting diode and preparation method thereof

A light-emitting diode and fluorescent technology, applied in semiconductor/solid-state device manufacturing, electrical components, electric solid-state devices, etc.

Active Publication Date: 2020-11-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still great difficulties in the preparation of high-efficiency and long-life blue OLEDs by phosphorescence sensitization, and more effective blue light methods need to be found to solve this problem.

Method used

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  • Full-fluorescence type white light organic light emitting diode and preparation method thereof
  • Full-fluorescence type white light organic light emitting diode and preparation method thereof
  • Full-fluorescence type white light organic light emitting diode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] A fully fluorescent white OLEDs (W1) combined with TTA and phosphorescent sensitization, the schematic diagram of which is shown in figure 1 shown.

[0046] First, ultrasonically treat the ITO glass with alkaline washing solution, then rinse it with tap water, then rinse it with deionized water, blow dry the water on the surface of the ITO glass with high-pressure nitrogen, and then put the ITO glass in an oven to bake for 30 minutes , and then treat the surface of the ITO glass with ultraviolet ozone for 6 minutes, put it into the vacuum coating machine, when the pressure of the coating machine drops to 1×10 -4 When Pa is lower than that, thin films are sequentially deposited on ITO glass. First, the hole injection layer material HAT-CN is evaporated on the surface of the ITO conductive glass with a thickness of 15nm. Then, the hole transport layer material TAPC is sequentially evaporated, with a thickness of 60nm; the electron blocking layer material TCTA, with a th...

Embodiment 2

[0050] A fully fluorescent white OLEDs (W2) combined with TTA and phosphorescent sensitization, the schematic diagram of which is shown in Image 6 shown.

[0051] First, ultrasonically treat the ITO glass with alkaline washing solution, then rinse it with tap water, then rinse it with deionized water, blow dry the water on the surface of the ITO glass with high-pressure nitrogen, and then put the ITO glass in an oven to bake for 30 minutes , and then treat the surface of the ITO glass with ultraviolet ozone for 6 minutes, put it into the vacuum coating machine, when the pressure of the coating machine drops to 1×10 -4 When Pa is lower than that, thin films are sequentially deposited on ITO glass. First, the hole injection layer material HAT-CN is evaporated on the surface of the ITO conductive glass with a thickness of 15nm. Then, the hole transport layer material TAPC is sequentially evaporated, with a thickness of 60nm; the electron blocking layer material TCTA, with a th...

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Abstract

The invention discloses a full-fluorescence type white light organic light-emitting diode and a preparation method thereof. A light-emitting layer of OLEDs is formed by combining a red light-emittinglayer, a spacer layer and a blue light-emitting layer. The red light emitting layer is formed by jointly doping a phosphorescent sensitizer and a red light fluorescent object into a host material; thephosphorescent sensitizer is Ir(tptpy)2(acac), and the doping concentration of the phosphorescent sensitizer is 5-15wt.% of that of the main body material; the spacer layer is formed by blending TCTAand Bepp2 according to the weight ratio ranging from 3: 1 to 1: 3. and the blue light emitting layer is formed by doping a blue light fluorescent object material into a TTA host material. According to the organic electroluminescent device, a mode of combining TTA and phosphorescence sensitized fluorescence is adopted, and the bipolar spacer layer is introduced at the same time, so triplet excitons of the blue light emitting layer and the red light emitting layer are efficiently utilized at the same time through two different mechanisms; in addition, a green light fluorescent material is dopedin the electron transport layer, the prepared OLEDs have the characteristics of high efficiency, low roll-off, long service life and stable spectrum.

Description

technical field [0001] The invention belongs to the technical field of organic light-emitting diodes, and in particular relates to an all-fluorescence white light organic light-emitting diode combining triplet-triple annihilation (TTA) and phosphorescence sensitization and a preparation method thereof. Background technique [0002] Organic Light-Emitting Diodes (OLEDs) have the advantages of lightness and thinness, self-luminescence, high color gamut, simple fabrication process, easy large-area fabrication, flexibility and bendability, and have received extensive attention and research. White light OLEDs are used in the field of lighting. Their spectrum is adjustable and the light color is soft. It can be prepared as a lighting source similar to sunlight, reducing the damage of blue light to human eyes. It is an efficient, green and healthy lighting technology. [0003] White OLEDs have two important indicators: one is to obtain high device efficiency, including power effici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/56
CPCH10K50/11H10K2101/40H10K50/12H10K50/125H10K71/00
Inventor 马东阁姚晶文代岩峰孙倩杨德志乔现锋陈江山
Owner SOUTH CHINA UNIV OF TECH
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