High performance organic electroluminescent device and preparation method thereof

Abstract

The invention discloses a high performance organic electroluminescent device and a preparation method thereof. The method includes performing ultrasonic cleaning on an anode ITO transparent conductiveglass substrate, and performing baking until drying; processing the ITO transparent conductive glass substrate by using an ultraviolet lamp and ozone; placing the ITO transparent conductive glass substrate in a vacuum chamber, and performing vacuum pumping; performing successive vacuum evaporation of a hole injection layer, a hole transport layer and an electron and exciton barrier layer on the ITO transparent conductive glass substrate; continuously performing evaporation of a photochromic filling based white light emitting layer on the ITO transparent conductive glass substrate; and continuously performing evaporation of an electron transport layer, an electron injecting layer and a metal cathode electrode. WOLED devices with high CRI and CIE color coordinates meeting an ANSI standard can be realized in a white light system consisting of binary monochromatic lights; the adjustment from cool white light (5,000K) to warm white light (2,000K) can be realized; and the preparation of high performance WOLED devices can be realized, and therefore, the process of preparing devices can be greatly simplified, and preparation costs can be reduced.

Description

technical field [0001] The invention relates to the field of organic light-emitting semiconductor devices, in particular to a high-performance organic electroluminescent device and a preparation method thereof. Background technique [0002] White organic light-emitting diode (WOLED) has the characteristics of thinness, flexibility, fast response, no need for backlight, energy saving, healthy eye protection, etc. Therefore, it is known as the next generation of solid-state display and lighting technology. Currently, WOLED technology has been applied in smart phones, smart watches, MP3 displays and flat-panel TVs. Moreover, it has also received extensive attention and development in the fields of indoor lighting and automobile taillights. [0003] The WOLED device is a self-luminous device that does not require a backlight source. The device structure adopts "transparent conductive anode-organic functional layer-metal cathode". Its working principle is to apply a suitable ex...

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Problems solved by technology

[0007] To sum up, there are a series of problems existing in the existing devices based on high-performance organic light-emitting diodes (OLEDs): (1) Currently, WOLED devices usually use one or two light-emitting units to form white light. The coverage range is severely limited, resulting in a lower CRI and a serious shift in the color coordinates CIE-(x,y); (2) In the current method of preparing WOLED devices using one or two light-emitting units, it is impossible to realize the process from cold Precise adjustment of white light (5000K) to warm white light (2000K); (3) In traditional methods, white light emission of three or more different monochromatic light combinations can achieve high-performance WOLEDs, but complex device structure design, The distribution and regulation of excitons inside the device, the control of the luminous intensity of different light-emitting units, and the complex actual device preparation process and cost limit its further development; (4) in WOLED devices based on traditional ternary or even more multi-component systems, in Under different working conditions, the spectral stability is poor, and the relative luminous intensity of multiple light-emitting units will drift

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