A kind of oled display device and preparation method thereof

Abstract

The invention relates to the field of display technology, provides an organic water and oxygen barrier material, and also provides an OLED display device and a preparation method thereof, wherein the OLED display device is provided with a water and oxygen barrier layer between the OLED light-emitting layer and the light extraction layer, The water and oxygen barrier layer is formed by using the above-mentioned organic water and oxygen barrier material. In addition to the good barrier properties of all-glass encapsulation for water vapor and oxygen to prevent water and oxygen from entering the airtight cavity, the invention also introduces a water and oxygen barrier layer, which further comprehensively prevents water vapor and oxygen from entering the OLED light-emitting layer and prolongs the OLED light-emitting layer. Service life; the present invention further adds SiO2 nanoparticles in the water-oxygen barrier layer to ensure high light output efficiency and color uniformity.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an OLED display device and a preparation method thereof. Background technique [0002] Organic Electroluminescence Display (OLED) has the advantages of high brightness, wide viewing angle, active light emission, high contrast, ultra-thin and portable, and has become a new type of flat panel display device researched and developed in recent years. However, OLED display devices also have some fatal bottlenecks, one of which is the lifespan of OLED display devices. The main causes of this problem are: [0003] 1) Since the cathode of the OLED display panel is usually made of a metal with a lower work function, when there is H 2 O and O 2 When it reacts with the metal, it will cause the cathode to rise and the performance of the device to deteriorate; [0004] 2)O 2 It is a triplet quencher itself, and the organic light-emitting material is O 2 Oxidation produces carbonyl comp...

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Problems solved by technology

[0003] 1) Since the cathode of the OLED display panel is usually made of a metal with a lower work function, when there is H 2 O and O 2 When it reacts with the metal, it will cause the cathode to rise and the performance of the device to deteriorate;

[0004] 2)O 2 It is a triplet quencher itself, and the organic light-emitting material is O 2 Oxidation produces carbonyl compounds (black spots), which lead to a significant reduction in the quantum efficiency of luminescence;

[0005] 3) For other organic functional materials in the OLED light-emitting layer may also be O 2 Oxidation, leading to deterioration of the performance of OLED display devices

Glass has a good isolation effect on water vapor and oxygen, but because the barrier performance of glass powder to water vapor and oxygen is much lower than that of glass, and for the glass powder packaging method, micro-cracks and bubbles are prone to occur during the packaging process. resulting in a decrease in water-oxygen barrier properties

When water and oxygen enter the OLED light-emitting layer, it will chemically react with the metal and organic materials in the OLED light-emitting layer, resulting in poor device performance and black spots.

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