Preparation method for light emitting diode by taking carbon quantum dots as light emitting layer

Abstract

The invention relates to a preparation method for a light emitting diode by taking carbon quantum dots as a light emitting layer. For overcoming the shortcomings of the used material, structural characteristics and light emitting property of the light emitting diode, the carbon quantum dots are prepared firstly; then the carbon quantum dots are used as the light emitting layer and conductive glass is used as a base layer; next, a hole transport layer and the light emitting layer are spin coated; and an electron transfer layer, an electron injection layer and a negative electrode layer are evaporated to prepare the light emitting diode; the prepared light emitting diode adopts a seven-layer structure; the carbon quantum dot light emitting layer is excellent in the light emitting property, and the luminance can achieve 70cd / m<2>; the preparation method is advanced in technology and accurate and detailed in data; a continuous technological process can be formed from the preparation of the light emitting material to the preparation of the light emitting diode; and therefore, the preparation method is an advanced preparation method for the light emitting diode by taking the carbon quantum dots as the light emitting layer.

Description

technical field [0001] The invention relates to a preparation method of a light-emitting diode using carbon quantum dots as a light-emitting layer, and belongs to the technical field of light-emitting materials and device preparation and application. Background technique [0002] Quantum dot electroluminescent diode QD-LEDs is a light-emitting diode based on quantum dot electroluminescence. It is a light-emitting device that combines inorganic nano-quantum dots with organic materials. Quantum dots are the matrix material for QD-LEDs to emit light. QD-LEDs have many advantages compared with organic electroluminescent devices OLED: the luminous color of QD-LEDs can be adjusted by controlling the size of quantum dots, and has high color saturation; the luminescent material of QD-LEDs is an inorganic quantum dot material, which has High resistance to water and oxygen, can maintain the stability of performance and structure, and has low packaging requirements; QD-LEDs can produce...

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Problems solved by technology

[0003] As the matrix luminescent material of QD-LEDs, quantum dots are a kind of nanomaterials ≤ 10nm. In semiconductor devices, quantum dots are used as light-emitting layers, and organic materials are used as electron-transporting layers and hole-transporting layers. Experiments have proved that they have good luminescent properties; Due to the narrow emission spectrum of semiconductor quantum dots, the semiconductor quantum dot light-emitting devices produced have a narrow visible spectrum. Semiconductor quantum dots contain cadmium and other toxic heavy metals, which limits the scope of application.

[0004] Carbon quantum dots (CQDs) are carbon nanomaterials with low toxicity, high photostability and chemical stability, and have broad application prospects in light-emitting devices, but there are still many technical drawbacks in the preparation process. still under scientific research

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