WOLED device

Abstract

The invention provides a WOLED device. The WOLED device comprises a total reflection anode, a hole transport layer, an electron blocking layer, a red phosphorescent light emitting layer, a blue fluorescent light emitting layer, a green phosphorescent light emitting layer, a hole blocking layer, an electron transport layer and a semi-transparent cathode which are stacked from the bottom up in sequence, wherein the main body material of the red phosphorescent light emitting layer is a hole transport type main body material; the main body material of the blue fluorescent light emitting layer is a bipolar transport type main body material; and the main body material of the green phosphorescent light emitting layer is an electron transport type main body material. By virtue of the additional electron blocking layer and the hole blocking layer, and by adoption of the total reflection anode and the semi-transparent cathode, electron and hole utilization rate can be improved effectively; and in addition, by selecting the reasonable main body materials and energy level design, singlet state exciton and triplet state exciton generated by the blue fluorescent layer can be fully utilized, thereby greatly improving the luminous efficiency of the WOLED device.

Description

technical field [0001] The invention relates to the field of flat panel displays, in particular to a WOLED device. Background technique [0002] The active matrix flat panel display has many advantages such as thin body, power saving, and no radiation, and has been widely used. Among them, organic light-emitting diode (OLED) display technology is a promising flat panel display technology, which has very excellent display performance, especially self-illumination, simple structure, ultra-thin, fast response , wide viewing angle, low power consumption, and flexible display, it is known as a "dream display", and its production equipment investment is much smaller than that of a thin film transistor-liquid crystal display (Thin Film Transistor-Liquid Crystal Display, TFT-LCD) , has been favored by major display manufacturers, and has become the main force of the third-generation display devices in the field of display technology. At present, OLED is on the eve of mass producti...

AI Technical Summary

Problems solved by technology

[0004] At present, both singlet excitons and triplet excitons produced by phosphorescent materials can be utilized, and the WOLED devices prepared by them have higher efficiency; while only singlet excitons can be utilized by fluorescent materials, the WOLED devices prepared by them have higher efficiency. very low (<25%)

But so far, no suitable blue phosphorescent material has been found, and WLOED devices can only be designed by combining blue fluorescent materials with red and green phosphorescent materials, so that the triplet excitons produced by blue fluorescent materials cannot be released. utilization, therefore the efficiency of WLOED devices is greatly limited

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