Iridium OLED Compounds for Filter-Free Saturated Color Emission
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Solution Overview
Problem
Existing organic light-emitting diodes (OLEDs) face challenges in achieving saturated red, green, and blue colors for full color displays, with conventional methods relying on absorption filters for white light emission, which may not meet industry standards for color accuracy.
Innovation Solution
Development of organic compounds with specific structures, such as Ir(LA)x(LB)y(Lc)z, and ligands LA″ comprising Formula III, which are used in OLEDs to enhance color emission, allowing for direct production of saturated colors without the need for filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional white OLED with absorption filters is used, then device structure is simpler, but color accuracy and saturation do not meet industry standards
Solution Approach 1:
The patent applies color changes by designing organic compounds with specific molecular structures that directly emit saturated red, green, and blue colors. The compounds utilize phosphorescent and thermally activated delayed fluorescent mechanisms to achieve pure color emission without requiring absorption filters, thereby meeting industry standards for color accuracy while simplifying the device structure
Solution Approach 2:
The patent employs parameter changes by modifying molecular structures of organic compounds, including adjusting ligand configurations (LA, LB, Lc) and substituent groups (RA′, RB′, RC′, RD′, RE) to precisely control emission wavelengths. This enables direct generation of saturated colors with specific CIE coordinates, achieving high color accuracy without complex filtering systems
2Ease of manufacture
If absorption filters are used for color production, then material cost is lower, but energy efficiency decreases
Solution Approach 1:
The patent extracts and eliminates the absorption filter component from the OLED structure by using organic compounds that directly emit saturated colors. This removes the energy loss associated with filtering out unwanted wavelengths, as the compounds generate only the desired colors through phosphorescent and TADF mechanisms, significantly improving energy efficiency
Solution Approach 2:
The patent replaces the passive optical filtering mechanism with an active molecular emission mechanism. Instead of using absorption filters to subtract unwanted colors from white light, the organic compounds directly generate saturated colors through controlled photophysical processes, eliminating energy waste and improving overall device 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 proposed compounds and ligands improve color accuracy and efficiency in OLEDs, enabling the direct generation of saturated red, green, and blue pixels, meeting industry standards for full color displays.
Implementation Method 1
One application for phosphorescent emissive molecules is a full color display
Implementation Method 2
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
The disclosure provides a compound having a Formula Ir(LA)x(LB)y(Lc)z or Ir(LA″)p(LB)q(Lc)r,wherein:LA has a structure of Formula IA LA″ comprising a structure of Formula III: LB has a structure of Formula IB: LC is a bidentate ligand; and a structure of Formula II, is fused to at least one of moieties A, B, C, D, or ring H. Formulations, OLEDs, and consumer products containing the same are also provided.