Full-band High-CRI OLED with Doped Emissive Layers
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Solution Overview
Problem
Conventional OLED devices have a poor color rendering index (CRI), making them unsuitable for long-term use as light sources, despite their high efficiency and other advantages.
Innovation Solution
A full-band and high-CRI organic light-emitting diode is developed, comprising a first conductive layer, multiple light-emitting layers doped with various dyes to emit blackbody radiation complementary lights, which mix to produce a full-band and high-CRI light, with chromaticity coordinates surrounding a specific area on the 1931 CIE Chromaticity Diagram that fully encloses the Planck's locus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional OLED device structure with electron transport layer and hole transport layer is used, then high efficiency is achieved, but color rendering index (CRI) is poor
Solution Approach 1:
The patent divides the light-emitting function into multiple separate light-emitting layers (first light-emitting layer, second light-emitting layer, third light-emitting layer), each doped with different dyes to emit different blackbody radiation complementary lights. This segmentation allows each layer to contribute to different portions of the spectrum, collectively achieving high CRI while maintaining the efficiency benefits of the conventional OLED structure.
Solution Approach 2:
The patent employs composite doping of multiple dyes (including but not limited to cyanine dyes, cyanine dye derivatives, squarylium dyes, and their derivatives) within the light-emitting layers. These composite dye systems work together to generate blackbody radiation complementary lights that combine to form full-band high-CRI light, resolving the contradiction between efficiency and color rendering quality.
2Productivity
If white light OLED device is used, then high efficiency is achieved, but long-term use as light source is unsuitable due to poor CRI
Solution Approach 1:
The patent changes the spectral parameters by introducing multiple dyes with specific absorption and emission characteristics that generate blackbody radiation complementary lights. By carefully selecting dye types and concentrations, the device emits a composite spectrum that encloses the Planck's locus on the 1931 CIE Chromaticity Diagram, achieving CRI≥90 and making the device suitable for long-term use as a high-quality light source while preserving high efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves a high Color Rendering Index of up to 92.2 and adjustable color temperature, enabling the production of full-band and high-CRI light with improved color accuracy and stability.
Implementation Method 1
a plurality of dyes are doped in the light-emitting layers for making the light-emitting layers emit a plurality of blackbody radiation complementary lights
Implementation Method 2
make the light-emitting layers emit a plurality of blackbody radiation complementary lights
Data Source
AI summary
The present invention relates to a full-band and high-CRI organic light-emitting diode, comprising: a first conductive layer, at least one first carrier transition layer, a plurality of light-emitting layers, at least one second carrier transition layer, and a second conductive layer. In the present invention, a plurality of dyes are doped in the light-emitting layers, so as to make the light-emitting layers emit a plurality of blackbody radiation complementary lights, wherein the chromaticity coordinates of the blackbody radiation complementary lights surround to a specific area on 1931 CIE (Commission International de'Eclairage) Chromaticity Diagram, moreover, the specific area fully encloses the Planck's locus on 1931 CIE Chromaticity Diagram, such that the blackbody radiation complementary lights mix to each other and then become a full-band and high-CRI light.