Pt/Pd OLED Emitters for Saturated Color Without Filter Loss
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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 with a specific structure (Formula I) that can be used in the organic layer of OLEDs, enabling direct emission of saturated colors without the need for complex stack structures or filters, by incorporating a metal coordination compound with tailored energy levels and substituents for enhanced color tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional methods use complex stack structures or absorption filters for white OLEDs, then color emission can be achieved, but device complexity and efficiency are reduced
Solution Approach 1:
The patent combines multiple emissive functionalities into a single compound molecule (Formula I) that can emit saturated red, green, and blue colors simultaneously or selectively. This merges the functions of multiple separate emissive layers or filters into one integrated component, reducing device complexity while maintaining color emission efficiency
Solution Approach 2:
The compound of Formula I serves multiple functions: it acts as an emitter for saturated colors, a sensitizer for energy transfer, and a charge transporter. This multi-functionality eliminates the need for separate components for each function, simplifying the overall OLED structure while improving efficiency
2Loss of energy
If absorption filters are used to produce saturated colors from white backlight, then color accuracy can be achieved, but energy loss increases
Solution Approach 1:
Instead of using absorption filters that waste energy by absorbing non-emitted wavelengths, the patent employs fluorescent or phosphorescent emitters that convert electrical energy directly into desired color emissions. The energy that would have been lost in filtering is now productively converted into light emission, reducing energy loss while maintaining color accuracy
Solution Approach 2:
The patent modifies molecular parameters (substituents R1-R6, ring structures) of the compound to precisely tune emission wavelengths and colors. By changing molecular structure parameters rather than using physical filters, the system achieves accurate color emission with minimal energy loss
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 allows for efficient, direct emission of saturated colors, simplifying the OLED structure and improving color accuracy and efficiency in displays.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Implementation Method 2
The compound allows for efficient, direct emission of saturated colors
Implementation Method 3
metal M is Pt or Pd
Data Source
AI summary
The subject application relates to organic electroluminescent materials and devices. A compound is provided that has a structure including Formula I,In Formula I, ring A is a 5-membered or 6-membered ring; each of moiety B and C is a monocyclic ring or a polycyclic fused ring system; metal M is Pt or Pd; each of Z1, Z2, and X1 to X14 is C or N; each of K1, K2, and K3 is a direct bond or a linker; each of L1, L2, and L3 is a direct bond or a linker; each R substituent is hydrogen or a General Substituent defined herein; each of R1 and RF is a General Substituent defined herein; and any two substituents can be joined or fused to form a ring. Formulations, OLEDs, and consumer products containing the compound are also provided.