Pt/Pd Organic Compound for Saturated OLED Color Emission
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Solution Overview
Problem
Current organic light-emitting diode (OLED) technologies face challenges in achieving saturated colors for full-color displays, particularly in producing red, green, and blue pixels, which are essential for industry standards, and there is a need for materials that can efficiently emit light while maintaining performance and cost-effectiveness.
Innovation Solution
The development of a compound with a specific structure, Formula I, which includes Pt or Pd as the metal, 5- or 6-membered carbocyclic or heterocyclic rings, and various substituents, is used in the organic layer of OLEDs to enhance light emission and color saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
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 employs parameter changes by systematically varying the chemical structure of organic compounds, specifically modifying the core moiety (e.g., using carbazole, dibenzofuran, dibenzothiophene) and substituent groups to tune the HOMO-LUMO energy gap. This structural parameter adjustment directly controls the emission wavelength and color saturation, enabling saturated red, green, and blue emission while maintaining organic material advantages
Solution Approach 2:
The patent utilizes composite materials by designing molecules with combined functional units: a core emitting moiety coupled with electron-donating or electron-withdrawing substituents. These composite molecular structures enable fine-tuning of optical properties and charge transport characteristics, achieving both saturated color emission and improved device performance without sacrificing the inherent advantages of organic materials
2Illumination intensity
If white OLED with absorption filters is used to produce saturated colors, then full-color display capability is achieved, but light efficiency and brightness are reduced
Solution Approach 1:
The patent extracts the color filtering step by directly emitting saturated colors from the OLED structure itself through tailored organic compound emission. Instead of using a white backlight with absorption filters, the invention designs emissive materials that inherently produce saturated red, green, and blue light, eliminating the energy loss associated with filtering and improving overall light efficiency
Solution Approach 2:
The patent applies color changes by designing organic compounds with specific HOMO-LUMO energy gaps that correspond to desired emission colors. By adjusting molecular structure parameters, the emission wavelength is precisely controlled to produce saturated colors directly, converting electrical energy efficiently into the desired color emission without intermediate filtering steps
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 improves the emission properties of OLEDs, enabling the production of saturated colors and potentially reducing production costs by using more cost-effective organic materials, thus addressing the limitations of existing OLED technologies.
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 having a structure of Formula I,is provided. In Formula I, M is Pt or Pd; rings A, B, C, and D are 5-membered or 6-membered rings; one of Z1, Z2, and Z3 is N and the other two are C; each of X1 to X10 is C or N; K is a direct bond, O, S, N(Rα), P(Rα), B(Rα), C(Rα)(Rβ), or Si(Rα)(Rβ); each of L1 and L2 is a direct bond or a linker; each R, R′, R″, Rα, Rβ, RA, RB, RC, RD, and RE is hydrogen or a General Substituent; R1 is a substituent; at least one RE comprises a substituent selected from the group consisting of aryl, heteroaryl, cycloalkyl, and heteroalkyl; any two substituents may be joined or fused to form a ring, except that RE at X3 or X4 cannot be joined with RA to from a ring. Formulations, OLEDs, and consumer products including the compound are also provided.