Platinum and Palladium OLED Compounds for Saturated Color Emission
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Solution Overview
Problem
Current organic light-emitting diode (OLED) technologies face challenges in achieving saturated red, green, and blue emissions for full-color displays, as existing phosphorescent emissive molecules do not meet industry standards for color accuracy and efficiency.
Innovation Solution
A compound of Formula I, where M is Pt or Pd, and moieties B, C, D, and E represent specific ring systems, is used in an OLED structure to enhance emission spectra and achieve precise color coordination through careful selection of bonds and substituents, allowing for improved color accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional phosphorescent emissive molecules are used in OLEDs, then device simplicity is maintained, but color accuracy and saturation do not meet industry standards
Solution Approach 1:
The patent modifies molecular parameters (electron-withdrawing groups, substituent positions, ligand types) to precisely control emission wavelength and color saturation. By changing chemical parameters of the phosphorescent emissive molecule, the invention achieves saturated red, green, and blue emissions meeting industry CIE coordinate standards without requiring complex device structures.
Solution Approach 2:
The invention uses composite molecular structures combining metal centers (Ir, Pt, Pd) with organic ligands and electron-withdrawing groups to create phosphorescent emissive molecules with tailored emission properties. These composite materials enable precise color control while maintaining efficient single-molecule emission, resolving the contradiction between color accuracy and structural complexity.
2Productivity
If existing phosphorescent emissive molecules are used, then ease of manufacture is maintained, but emission efficiency and color saturation are insufficient
Solution Approach 1:
The patent introduces electron-withdrawing groups at specific local positions on the phosphorescent emissive molecule to enhance color saturation and emission efficiency. By strategically placing functional groups at particular locations on the molecular structure, the invention achieves high productivity without requiring complex multi-step synthesis procedures.
3Manufacturing precision
If conventional OLED structures are used, then device simplicity is maintained, but color saturation and CIE coordinates do not meet display standards
Solution Approach 1:
The invention extracts the color control function from complex multi-layer emissive structures and concentrates it into a single phosphorescent emissive molecule. By taking out the color determination function and embedding it in the molecular level, the patent achieves precise CIE coordinates while maintaining overall device simplicity.
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 enables OLEDs to emit saturated colors with improved color accuracy and efficiency, meeting industry standards for CIE coordinates, and exhibits desirable emission properties such as narrow full-width at half max (FWHM) and reduced vibronic peak intensity, enhancing display performance.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Implementation Method 2
One application for phosphorescent emissive molecules is a full color display
Data Source
AI summary
A compound of Formula I,is provided. In Formula I, M is Pt or Pd; moieties B, C, and D are independently a monocyclic ring or a polycyclic fused ring system; moiety E is a monocyclic ring or a bicyclic fused ring system; n is 0, 1, or 2; K and K1 to K3 are independently a direct bond or a linker; Z is C or a heteroatom; each of Z1 to Z3 is independently C or N; X is CR, CRR′, NR, or PRR′; each of XC, XD, X1 to X3 and X8 to X12 is independently C or N; L1 is a direct bond or a linker; L2 is absent a bond, a direct bond, or a linker; each of Q1 and Q2 is a direct bond or a linker; each R substituent is independently hydrogen or a General Substituent. Formulations, OLEDs, and consumer products containing the same are also provided.