A light-emitting device, its manufacturing method, and display device

Abstract

Embodiments of the present invention provide a light-emitting device, a preparation method thereof, and a display device, which relate to the field of display technology and can solve the problem of color shift in light-emitting devices caused by transmission of high-energy excitons, while reducing energy consumption of the device. The light-emitting device comprises: an anode and a cathode arranged oppositely, a hole transport layer close to the anode, an electron transport layer close to the cathode; a light-emitting functional layer located between the hole transport layer and the electron transport layer ; The light-emitting functional layer includes: at least two quantum dot light-emitting layers that emit light of different colors; a transparent insulating layer located between any two adjacent quantum dot light-emitting layers. It is used for the preparation of a light emitting device and a display device including the light emitting device.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a light-emitting device, a preparation method thereof, and a display device. Background technique [0002] Quantum dots (Quantum dot) have the advantages of tunable emission wavelength, narrow emission band (15-30nm), good light, heat and chemical stability, and are easy to prepare by solution method, etc., and are widely used in quantum dot electroluminescent devices (Quantumdot light-emitting diode, referred to as QLED). Since QLED combines the unique optoelectronic advantages of quantum dot materials and the relatively mature OLED (Organic light-emitting diode, organic light-emitting diode) solution film-forming process, it is expected to be applied to a new generation of high-color quality, low-power flat panel display and lighting. , has received more and more attention from those skilled in the art. [0003] At present, QLED is mainly used as a white light source, such a...

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Problems solved by technology

Among them, because the blue light quantum dots emit a short blue light band (430-470nm), the excitons formed by the electrons and holes have high energy, and the energy is easily transferred to the green light quantum dots with a relatively long emission wavelength (the green light band is 500nm). ~560nm), red light quantum dots (the red light band is 620-780nm); green light quantum dots emit green light shorter than red light, and the excitons formed by electrons and holes have higher energy, and the energy is easily transferred to the light-emitting quantum dots. Red light quantum dots with relatively long wavelengths, resulting in enhanced luminescence of long-wavelength green light quantum dots or red light quantum dots, and weakened light emission of relatively short-wavelength blue light quantum dots or green light quantum dots, accompanied by the conversion of the above-mentioned high-energy excitons into low Energy excitons, there is an energy loss phenomenon in the white light QLED, which leads to an increase in device energy consumption; at the same time, due to the weakening of the light emission of the relatively short-wavelength blue light quantum dots or green light quantum dots, the original light emission balance is broken, causing white light QLED light emission color shift, Affect the luminous effect of the device

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