OLED Metal Complex Emitters for Saturated RGB Without Filters
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Solution Overview
Problem
Existing organic light emitting diodes (OLEDs) face challenges in achieving saturated red, green, and blue pixel emissions required for full color displays, and conventional methods for white OLEDs often rely on complex stack structures or absorption filters, which can be inefficient.
Innovation Solution
Development of metal complexes with a coordination number of four, featuring coordinating atoms like O, S, Se, N, P, C, and Si, forming dative S/Se-metal bonds, which are incorporated into OLEDs to enhance emission efficiency and color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional white OLED structures are used with absorption filters to produce saturated colors, then color saturation can be achieved, but device complexity and efficiency are reduced due to the need for complex stack structures and filters
Solution Approach 1:
The patent extracts and removes the need for complex stack structures and absorption filters by directly incorporating emitters that emit saturated red, green, and blue colors. This eliminates the filtering step and simplifies the device architecture while maintaining color saturation.
Solution Approach 2:
The patent changes the emission parameters of the OLED by using specific metal complexes with coordinated atoms (O, S, Se, N, P, C, Si) that have tailored photophysical properties. These parameter changes enable direct emission of saturated colors without requiring additional filtering components.
2Illumination intensity
If conventional white OLED structures with absorption filters are used, then saturated color emission can be achieved, but energy efficiency is reduced due to absorption losses
Solution Approach 1:
The patent removes the absorption filter components that cause energy losses. By using emitters that directly produce saturated colors, the system eliminates the energy-wasting absorption and re-emission process, thereby improving overall energy efficiency.
Solution Approach 2:
The patent ensures continuous useful action by having the emitters directly convert electrical energy into the desired saturated color emission without intermediate absorption and re-emission steps. This continuous conversion process minimizes energy losses and improves efficiency.
3Device complexity
If simple OLED structures without specialized emitters are used, then device complexity is reduced, but emission efficiency and color purity are insufficient for saturated pixel emissions
Solution Approach 1:
The patent changes the chemical and photophysical parameters of the emitter materials by using metal complexes with specific coordinating atoms. These parameter changes enhance emission efficiency and color purity while maintaining relatively simple device structures, thus resolving the contradiction between simplicity and performance.
Solution Approach 2:
The patent employs composite materials in the form of metal complexes incorporating multiple coordinating atoms (O, S, Se, N, P, C, Si). These composite structures provide enhanced emission properties and color purity while allowing for simpler overall device architecture compared to conventional approaches.
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 metal complexes improve the emission efficiency and color purity of OLEDs, enabling the production of saturated red, green, and blue pixels without the need for complex stack structures or filters, thus enhancing display performance.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
Provided is a compound including a metal complex having a metal M with a coordination number of four with four coordinating atoms, Z1, Z2, Z3, and Z4, coordinated to the metal M. In the compound, each of Z1, Z2, Z3, and Z4 is independently selected from O, S, Se, N, P, C, Si, or B; at least one of Z1, Z2, Z3, or Z4 is S* or Se*, where S* and Se* represent S or Se, respectively, that form a dative bond with M; and the metal M is selected from Pt, Pd, Cu, Ag, Au, or Zn, Formulations, OLEDs, and consumer products containing the compound are also provided.