Platinum Palladium Heterocyclic Compounds for Saturated OLED Emission
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Solution Overview
Problem
Current organic light-emitting diode (OLED) technologies face challenges in achieving saturated colors, particularly in red, green, and blue emissions, which are essential for full-color displays, and existing materials may not efficiently meet the requirements for cost-effectiveness and flexibility.
Innovation Solution
A compound with a specific structure, Formula I, is introduced, comprising Pt or Pd as the metal center, with carefully defined rings, substituents, and bonding configurations, which is used in the organic layer of OLEDs to enhance color emission properties.
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 (particularly red, green, and blue) is insufficient
Solution Approach 1:
The patent modifies the molecular structure of organic emissive materials by incorporating specific heterocyclic rings (pyridine, pyrimidine, triazine) and adjusting substituents to change the HOMO-LUMO energy gap. This parameter change enables the material to emit saturated red, green, and blue light while maintaining the benefits of organic materials such as flexibility and cost-effectiveness.
Solution Approach 2:
The invention creates composite organic emissive materials that combine multiple functional units within a single molecular structure. These composite molecules integrate electron-donating and electron-withdrawing groups along with heterocyclic cores to achieve both saturated color emission and high efficiency, resolving the contradiction between color saturation and color accuracy.
2Illumination intensity
If white OLED with absorption filters is used, then color display is achieved, but emission efficiency and cost-effectiveness are reduced
Solution Approach 1:
The patent extracts and eliminates the need for absorption filters by designing organic emissive materials that directly emit saturated red, green, and blue light. This removes the energy-wasting filtering step while maintaining color display capabilities, thereby improving emission efficiency and cost-effectiveness.
Solution Approach 2:
By changing the molecular parameters of the emissive materials to achieve direct saturated color emission, the patent eliminates the need for post-emission color filtering. This parameter optimization allows the OLED to convert electrical energy directly into desired color light, reducing energy loss and improving overall emission efficiency.
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 the production of OLEDs with improved color accuracy and efficiency, potentially reducing production costs and increasing flexibility in device applications by optimizing the organic layer's performance.
Implementation Method 1
One application for phosphorescent emissive molecules is a full color display
Implementation Method 2
OLEDs make use of thin organic films that emit light when voltage is applied across the device
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.