Planar heterojunction sensitized organic fluorescence light-emitting diode and preparation method therefor

Abstract

The invention belongs to the technical field of organic photoelectric materials, and discloses a planar heterojunction sensitized organic fluorescence light-emitting diode and a preparation method therefor. The diode comprises a substrate, a positive electrode, a P type organic semiconductor layer, an N type organic semiconductor layer and a negative electrode that are laminated in sequence; at least one layer of the P type organic semiconductor layer and the N type organic semiconductor layer is doped with a fluorescent material; the P type organic semiconductor layer is made from an organic conductor material capable of well conducting holes, and the N type organic semiconductor layer is made from an organic conductor material capable of well conducting electronics. The electroluminescence spectrum of the organic fluorescence light-emitting diode comes from the doped organic fluorescent material, so that the organic fluorescence light-emitting diode is lower in driving voltage and higher in luminous efficiency, the internal quantum efficiency can reach 100% theoretically, and the organic fluorescence light-emitting diode is wide in application prospects.

Description

technical field [0001] The invention belongs to the technical field of organic photoelectric materials, and in particular relates to a planar heterojunction sensitized organic fluorescent light-emitting diode and a preparation method thereof. Background technique [0002] At present, the research on organic light-emitting diodes (OLEDs) has entered the stage of industrial application, and scientific research institutes, universities, and enterprises have invested a lot of manpower, material resources, and financial resources to carry out related research and application work. The research began in 1987. Dr. Deng Qingyun of Kodak Company of the United States used the sandwich device structure in the patent US4356429 to develop an OLED device with a luminous brightness of 1000cd / m2 driven by a DC voltage of 10V. 2 , so that OLED has achieved an epoch-making development. However, in this type of fluorescent OLED device, due to the limitations of spin statistics rules, only 25%...

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Problems solved by technology

However, rare metals are contained in phosphorescent luminescent materials, which will greatly limit the cost reduction of phosphorescent OLED devices. At the same time, problems such as short lifespan and poor light color purity of blue phosphorescent OLED devices have been difficult to solve.

[0003] These sensitized fluorescent OLED devices using materials with thermally activated delayed fluorescence characteristics as sensitized hosts or auxiliary hosts have the following disadvantages: (1) multi-layer organic layers make the device preparation process cumbersome, which is not conducive to the reduction of time cost; (2) The multi-layer and multi-type materials greatly increase the cost of materials required for device preparation; (3) There is a problem of phase stability between different organic phases, which may affect the life of the device; (4) Between different organic layers It is easy to have an interface voltage drop, which makes it difficult to reduce the driving voltage of the device and increases the power consumption of the device when it is working

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