OLED Emissive Compounds for Direct Saturated RGB Emission
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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 producing white light often require complex stack structures or absorption filters, which can be inefficient.
Innovation Solution
The development of organic compounds with specific structures (Formula I and Formula II) that can be used in OLEDs to emit saturated colors directly, eliminating the need for complex stack structures or filters, and enabling efficient production of red, green, and blue pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional methods using white backlight with absorption filters are used, then full color display can be achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention divides the white backlight source into separate red, green, and blue emissive layers within the OLED stack. Each layer emits a specific color directly through electroluminescence, eliminating the need for a single white backlight and absorption filters. This segmentation approach achieves full color display while reducing overall device complexity.
Solution Approach 2:
The invention extracts the color filtering function from the optical path by implementing direct color emission in the emissive layers. Instead of using absorption filters to remove unwanted wavelengths from white light, the patent takes out the filtering requirement entirely by generating red, green, and blue light directly from separate organic emissive materials.
2Adaptability or versatility
If absorption filters are used to produce saturated colors from white light, then color display is achieved, but energy efficiency decreases
Solution Approach 1:
The invention converts the inherent limitation of absorption filters (energy loss through absorption) into a benefit by using electroluminescent materials that directly emit the required colors. Each organic emissive layer is designed to emit specific wavelengths efficiently, converting electrical energy directly into the desired color light without the energy waste associated with filtering.
Solution Approach 2:
The invention changes the fundamental parameter of light generation from passive filtering of broadband white light to active electroluminescent emission at specific wavelengths. By selecting organic emissive materials with tailored HOMO-LUMO energy gaps, the patent optimizes the emission wavelength and energy efficiency for each color (red, green, blue) independently.
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 compounds enable the direct emission of saturated colors, simplifying the manufacturing process and improving the efficiency of OLEDs in producing full color 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 comprising a structure of Formula I,or Formula II,is provided. In such compounds, moiety X is a monocyclic ring or a polycyclic fused ring system; M is Pt, Pd, or Au; each of X1 to X15, Z1, and Z2 is C or N; each of L1 and L2 is a direct bond or a linking group; each of Y1 and K is a direct bond or a linking group; Y2 is a linking group; the chelate ring comprising M, K, Y1, L2, and Z2 has at least four ring atoms; each R moiety is hydrogen or a General Substituent defined herein. Formulations, OLEDs, and consumer products containing the same are further provided.