Hetero-benzofused Ligands for OLED Color Saturation
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Solution Overview
Problem
Current organic light-emitting diodes (OLEDs) face challenges in achieving saturated colors for full-color displays, particularly in red, green, and blue emission, which is crucial for industry standards, and there is a need for improved materials that can efficiently emit light with enhanced performance and flexibility.
Innovation Solution
A compound comprising a specific ligand LA of Formula I is introduced, which is used in the formulation of OLEDs. This ligand is coordinated to a metal and can form tridentate, tetradentate, pentadentate, or hexadentate ligands, enhancing the organic layer's performance by allowing for the formation of rings and specific substitutions, thereby improving the OLED's light emission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional organic materials are used in OLEDs, then cost advantages and flexibility are achieved, but saturated color emission for full-color displays is difficult to achieve
Solution Approach 1:
The patent modifies the chemical structure of organic ligands by introducing specific heterocyclic rings and substitution patterns (Formulas I-IV with various R groups) to change the electronic and optical parameters of the emissive materials, enabling saturated color emission while maintaining organic material benefits
Solution Approach 2:
The patent creates composite organometallic complexes combining organic ligands with metal centers (Ir, Pt, Os, Rh, Ru, Re, Ag, Au, Cu, Pd, Ni, Zn, Hf, Mo, W, Mn, Fe, Co, Ga, In, Tl, Al, B, Si, Ge, Sn, Pb, Bi, Zr, Hf, Ti, V, Nb, Ta, D, F, Cl, Br, I, At, Tc, Re, Bh, Mt, Ts, Nh, Mc, Fl, Lv, Ts, Og) to achieve both cost-effectiveness and saturated color emission properties
2Ease of manufacture
If conventional organic materials are used in OLEDs, then flexibility and cost advantages are achieved, but light emission performance and efficiency need improvement
Solution Approach 1:
The patent optimizes molecular parameters including HOMO-LUMO energy gaps, electron-hole recombination rates, and triplet energy levels through systematic ligand design to enhance light emission efficiency while preserving the flexibility inherent in organic materials
Solution Approach 2:
The patent achieves precise color control and enhanced emission efficiency by designing ligands with specific absorption and emission spectra through varied heterocyclic structures and substituent groups, allowing optimization of both efficiency and color properties
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 use of the compound in OLEDs leads to improved light emission characteristics, enabling the production of OLEDs with enhanced color saturation and efficiency, suitable for various applications including displays and illumination, leveraging the flexibility and cost advantages of organic materials.
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 are compounds comprising first ligands LA being hetero-benzofused ligands of Pt and Ir complexes for OLED applications. Also provided are formulations comprising these compounds comprising first ligands LA being hetero-benzofused ligands of Pt and Ir complexes for OLED applications. Further provided are OLEDs and related consumer products that utilize these compounds comprising first ligands LA being hetero-benzofused ligands of Pt and Ir complexes for OLED applications.