Free radical doublet sensitized fluorescent organic light-emitting device

Abstract

The invention discloses a free radical doublet sensitized fluorescent organic light-emitting device, which belongs to the technical field of organic light-emitting devices. The light-emitting layer of the device is a mixture of an organic light-emitting free radical molecular material and a non essential parent material, and a guest material is a fluorescent molecular light-emitting material; the organic light-emitting free radical molecular material and the fluorescent molecular light-emitting material together form a free radical doublet sensitized system, an energy donor is organic light-emitting free radicals and an energy receptor is fluorescent luminescent molecules. The excitation state of the organic light-emitting free radical molecules is the doublet, spin forbidden limitations do not exist in the case of transition to a ground state, the organic light-emitting free radicals serve as the main material of the light-emitting layer, through Forster energy transfer, guest fluorescent molecules can generate light-emitting singlet excitons, a fluorescent luminescent device with an internal quantum efficiency upper limit to be 100% is obtained, and thus, a new way to improve the internal quantum efficiency of the traditional fluorescent molecules is provided.

Description

technical field [0001] The invention belongs to the technical field of organic electroluminescent devices, and in particular relates to a free radical dual state sensitized fluorescent organic electroluminescent device. Background technique [0002] Organic electroluminescent devices have great application prospects in the fields of display and lighting because of their simple manufacturing process, wide range of materials, controllable structure, small thickness, and rollability. Nowadays, some electronic products, such as high-end mobile phones, tablet computers, and large-size TVs, have used organic electroluminescent diodes (AMOLED) as their display screens. Organic lighting technology is also constantly improving toward the goals of high efficiency, low cost, and long life. [0003] At present, in the prior art, the light-emitting layer of an organic electroluminescent device (OLED) is generally composed of a light-emitting material alone or a host material doped with ...

AI Technical Summary

Problems solved by technology

The heavy metals used in phosphorescent materials are expensive and the resources are scarce, which greatly increases the cost of OLEDs.

[0005] Organic fluorescent OLEDs use singlet excitons to emit light, but the upper limit of internal quantum efficiency is only 25%. Organic phosphorescent OLEDs use triplet excitons to emit light. Although they have high quantum efficiency, the materials are expensive and resources are scarce.

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