Laminated organic electroluminescence device

Abstract

The invention provides a laminated organic electroluminescence device, which comprises a first electrode, a first luminous unit, a third electron transmission layer, a second electron transmission layer, a first electron transmission layer, a charge generating layer, a second luminous unit and a second electrode in sequential laminated arrangement from bottom to top, wherein when both of the first electron transmission layer and the second electron transmission layer comprise n type doping agents, and the concentration of the n type doping agents in the first electron transmission layer is greater than the concentration of the n type doping agents in the second electron transmission layer, the third electron transmission layer does not contain n type doping agents; through the arrangement of the first, second and third electron transmission layers, the energy barrier of injecting electrons from the charge generating layer into the first luminous unit can be reduced, so that the injection of the electrons can be easy; the driving voltage is reduced; the device efficiency is improved; in addition, the service life of the device is prolonged; the color drift speed of the device is decelerated.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a laminated organic electroluminescent device. Background technique [0002] Organic Light Emitting Display (OLED) has self-illumination, low driving voltage, high luminous efficiency, short response time, high definition and contrast, nearly 180° viewing angle, wide operating temperature range, and can realize flexible display and With many advantages such as large-area full-color display, it is recognized by the industry as a display device with the most potential for development. [0003] According to the driving method, OLED can be divided into two categories: passive matrix OLED (Passive Matrix OLED, PMOLED) and active matrix OLED (Active Matrix OLED, AMOLED), namely direct addressing and thin film transistor matrix addressing. Among them, AMOLED has pixels arranged in an array, belongs to the active display type, has high luminous efficiency, and is usually used as a high...

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Problems solved by technology

[0006] However, like single-layer organic electroluminescent devices, stacked organic electroluminescent devices also have the problem of life decay. The life decay of stacked organic electroluminescent devices generally includes the life decay of each light-emitting unit and the life of the charge generation layer. Attenuation, the lifetime decay of the charge generation layer will further cause the brightness of one or several light-emitting units to decay, which in turn will cause a large color shift after a long-term use of the laminated organic electroluminescent device

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