Fluorescent/phosphorescent mixed white light OLED

A phosphorescence and fluorescence technology, which is applied in the field of white light OLED and fluorescent/phosphorescence mixed white light OLED, can solve the complex device structure of multi-emitting layer mixed white light OLED, limit the mass industrial production of white light OLED, and affect the stability of the device, etc., to achieve Effects of cost reduction, color stability balance, and preparation cost reduction
CN107086271AActive Publication Date: 2017-08-22TAIYUAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TAIYUAN UNIV OF TECH
Publication Date
2017-08-22

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Abstract

The invention provides a fluorescent / phosphorescent mixed white light OLED of which the light-emitting layer is composed of not less than two fluorescent light-emitting layers formed by the non-doped blue fluorescent material and phosphorescent light-emitting layers which are embedded among the fluorescent light-emitting layers. Any one phosphorescent light-emitting layer is composed of single phosphorescent material of which the thickness is not greater than 0.1nm. The mixed light emitted by different colors of phosphorescent material of all the phosphorescent light-emitting layers is complementary with the blue light emitted by the blue fluorescent material. Different colors of phosphorescent light-emitting layers are separated by 1-3nm blue fluorescent light-emitting material. The total thickness of the light-emitting layers is less than 30nm. Energy transmission between different colors of light-emitting material is changed by changing the order of embedding of the ultrathin phosphorescent light-emitting material in the blue fluorescent light-emitting layers or the thickness of different colors of ultrathin layers so that the emission spectrum of the white light OLED can be easily improved and the relatively ideal white light emission can be acquired.
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Description

technical field

[0001] The invention belongs to the technical field of organic semiconductor light-emitting devices, and relates to a white light OLED, in particular to a fluorescent / phosphorescent mixed white light OLED. Background technique

[0002] Organic light-emitting diodes (Organic light-emitting diodes, OLED) have the characteristics of surface light source, thinness, flexibility, transparency, etc., have been extensively researched and mature, and can be widely used in the field of next-generation lighting and display, with broad market space and Huge application prospects.

[0003] The light-emitting layer of a white OLED is usually composed of two or more light-emitting materials with complementary light colors. OLED light-emitting materials are divided into fluorescent materials and phosphorescent materials.

[0004] Since only singlet excitons in fluorescent materials can be used to emit light, the internal quantum efficiency of OLEDs based on fluorescent mat...

Claims

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