Pt/Pd OLED Emissive Compounds for Saturated RGB Pixels
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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
The development of a compound (LA)M(LB) with a specific structure of Formula I, comprising monocyclic or polycyclic fused ring systems, which can be used in the organic layer of OLEDs to enhance color emission, potentially replacing complex stack structures and absorption filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional white OLED structures with absorption filters are used, then color selection is achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts and eliminates the absorption filter layer from the conventional white OLED structure. By using a single-emissive-layer design with phosphorescent materials that directly emit saturated colors, the invention removes the need for separate absorption filters, thereby reducing structural complexity while maintaining color emission performance
Solution Approach 2:
The phosphorescent emissive layer serves multiple functions simultaneously: it generates light, determines color output, and eliminates the need for separate filtering layers. This multi-functional approach consolidates what were previously separate components (white light generation and color filtering) into a single material system
2Ease of manufacture
If white OLED with absorption filters is used, then color pixels are produced, but manufacturing precision and ease of manufacture deteriorate
Solution Approach 1:
The invention changes the fundamental parameter of color generation from spectral filtering (binary on/off filtering) to phosphorescent emission (continuous可调 spectrum). By selecting different phosphorescent materials with specific emission characteristics, the patent achieves color saturation control through material properties rather than precise filter positioning, thereby improving manufacturing precision
3Reliability
If conventional OLED materials are used, then basic light emission is achieved, but color saturation and display performance are insufficient
Solution Approach 1:
The patent employs composite phosphorescent materials comprising metal complexes (such as Ir(III), Pt(II), or Cu(I) complexes) combined with organic ligands. These composite materials leverage the high quantum efficiency of phosphorescence and the tunability of metal coordination chemistry to achieve saturated colors that conventional organic emitters cannot produce alone
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 compound (LA)M(LB) enables efficient production of saturated red, green, and blue emissions, simplifying the manufacturing process and improving the performance of OLEDs in displays.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
A compound (LA)M(LB) including a structure of Formula I,and at least one structure of Formula II,In the compound, each of moiety A and moiety B is a monocyclic ring or a polycyclic fused ring system; each of Z1, Z2, and X1 to X11 is independently C or N; at least one of X4 to X11 is N; Y is O, S, or Se; Y1, A1, and A2 is single atom linkers; each of L1 and L2 is a direct bond or a linker; M is Pt or Pd; each of K, K1 to K3 is a direct bond or a linker; and each R substituent is hydrogen or a General Substituent defined herein; and any two substituents may be fused or joined to form a ring. Formulations, OLEDs, and consumer products containing the compound are also provided.