High stability all-inorganic perovskite quantum dot film and preparation method thereof

Abstract

The invention relates to a highly stable all-inorganic perovskite quantum dot film and a preparation method thereof. The quantum dot film comprises an all-inorganic perovskite quantum dot layer, an upper water oxygen barrier layer, a pressure-sensitive adhesive layer, and a lower water oxygen barrier layer, the pressure-sensitive adhesive layer is used to bond the all-inorganic perovskite quantum dot layer and the upper water oxygen barrier layer; %~99.88% fluororesin, 0.10%~1.94% anti-blue light additive. The all-inorganic perovskite quantum dots are dispersed in the gaps of the fluororesin network structure, and fluororesin and anti-blue light additives are introduced into the all-inorganic perovskite quantum dot layer to ensure that the all-inorganic perovskite quantum dots provided by the present invention While the film has high color gamut and high brightness, it can also prevent the problem of excessive blue light when the quantum dots fail, thus providing a highly stable all-inorganic perovskite quantum dot film.

Description

technical field [0001] The invention relates to the field of thin film technology, in particular to an all-inorganic perovskite quantum dot film applied to a backlight module and a preparation method thereof. Background technique [0002] ABX developed in recent years 3 Due to the characteristics of low synthesis cost, high carrier mobility, and large light absorption coefficient, the type perovskite quantum dot material is a very potential photovoltaic material and has become a current research hotspot. Compared with the commonly used organic-inorganic hybrid perovskite quantum dots (CH 3 NH 3 wxya 3 ), all-inorganic perovskite quantum dots (CsPbX 3 ) shows more excellent stability and has greater application value. Compared with classical cadmium selenide quantum dots, all-inorganic perovskite quantum dots have a narrower half-width (15-25nm), extremely high fluorescence quantum efficiency (90%) and a wider color gamut (150% NTSC), so it has important application pro...

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Problems solved by technology

[0003] Chinese patent 201710226867.2 discloses a preparation method of high-stability all-inorganic perovskite quantum dots, which mainly uses metal halide perovskite nanocrystalline particles to wrap SiO 2 , so that the stability is improved, but it does not provide how to use it in the field of quantum dot film and liquid crystal display

However, due to the characteristics of the perovskite quantum dot material itself, it is easily affected by temperature, humidity, oxygen, light and solvents, etc., causing its structure to decompose and destroy, resulting in a decrease in luminous efficiency and a shortened luminous life.

Although the barrier film can block the entry of most of the oxygen and water vapor in the air, as time goes by, the perovskite quantum dot material will inevitably partly fail, and the blue light conversion efficiency will gradually decrease, eventually resulting in excessive blue light in the mixed light. color cast the display

Excessive blue light not only affects the display quality, but is also harmful to human eyes; especially the high-energy short-wave blue light of 380-450nm can pass through the lens and reach the retina, causing serious damage to vision

[0005] Chinese patent 201711213976.7 discloses a quantum dot film with anti-blue light effect. The quantum dot film includes a quantum dot layer, an upper barrier layer is provided on the upper surface of the quantum dot layer, a lower barrier layer is provided on the lower surface of the quantum dot layer, and an upper barrier layer is provided. Including anti-blue light material, which solves the problem of excessive blue light caused by the failure of quantum dots in the quantum dot film

However, the quantum dot film is a cadmium selenide quantum dot film, and its anti-blue light technology is not suitable for perovskite quantum dot film

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