Si-Ge Heterocyclic OLED Emitters for Saturated Color
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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 there is a need for materials that can efficiently emit light with improved performance and flexibility.
Innovation Solution
A compound comprising a heterocyclic ring or polycyclic fused ring system with Si or Ge atoms is developed, which includes specific chemical moieties such as triphenylene, carbazole, and dibenzofluorene, used in the organic layer of OLEDs to enhance light emission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional organic materials are used in OLEDs, then the device can be fabricated with cost advantages and flexibility, but the emission efficiency and color saturation performance are insufficient
Solution Approach 1:
The patent modifies the molecular structure parameters of organic emitters by incorporating specific heterocyclic rings (carbazole, dibenzofuran, dibenzothiophene, dibenzoselenophene, dibenzofluorene) and polycyclic fused ring systems with Si or Ge atoms. These structural parameter changes enable the material to achieve both high emission efficiency and saturated color performance while maintaining the cost and flexibility advantages of organic materials.
Solution Approach 2:
The patent creates composite organic compounds by combining multiple chemical moieties - heterocyclic rings, polycyclic fused ring systems, and various aromatic hydrocarbons (triphenylene, tetraphenylene, naphthalene). This composite molecular design allows the material to simultaneously achieve high emission efficiency, saturated color emission, and maintain the inherent flexibility and cost advantages of organic materials.
2Productivity
If conventional emitters are used to achieve saturated colors, then full-color display requirements can be met, but the emission efficiency and performance characteristics are limited
Solution Approach 1:
The patent applies local quality by introducing specific functional groups and chemical moieties at particular positions within the molecular structure. The heterocyclic rings and polycyclic fused ring systems are strategically positioned to enhance specific emission properties while maintaining overall molecular stability, thereby achieving both high emission efficiency and reliable color saturation performance.
Solution Approach 2:
The patent systematically changes molecular parameters by incorporating different heterocyclic rings (carbazole, dibenzofuran, dibenzothiophene, dibenzoselenophene, dibenzofluorene) and polycyclic fused ring systems with Si or Ge atoms. These parameter changes in molecular structure directly translate to improved emission efficiency and saturated color performance, resolving the contradiction between productivity and reliability.
3Productivity
If existing organic materials are used, then flexibility and cost advantages are maintained, but the light emission performance and efficiency are insufficient for advanced applications
Solution Approach 1:
The patent employs composite materials by combining multiple chemical moieties - heterocyclic rings, polycyclic fused ring systems, and aromatic hydrocarbons - into unified organic compounds. This composite approach enhances light emission performance and efficiency while the organic nature of the materials maintains flexibility and cost advantages, avoiding the need for complex inorganic structures.
Solution Approach 2:
The patent optimizes material structure by changing molecular parameters - incorporating specific heterocyclic rings and polycyclic fused ring systems with Si or Ge atoms. These controlled parameter changes improve light emission performance and efficiency without excessively increasing structural complexity, as the modifications are made within the framework of organic chemistry rather than transitioning to inorganic materials.
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 efficiency and flexibility of OLEDs, enabling the production of saturated colors and potentially more efficient light-emitting diodes with improved performance characteristics.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
Provided are compounds comprising a first chemical moiety, wherein the first chemical moiety comprises a first heterocyclic ring or a polycyclic fused ring system comprising at least one of the first heterocyclic ring; wherein the first heterocyclic ring comprises at least one Si or Ge atom as the ring atom; wherein in the polycyclic fused ring system, the at least one of the first heterocyclic ring has at most one bond being part of an aromatic ring; wherein the compound further comprises a second chemical moiety; wherein the second chemical moiety is selected from the group consisting of triphenylene, tetraphenylene, carbazole, dibenzothiophene, dibenzofuran, dibenzoselenophene, dibenzofluorene, benzo[d]benzo[4,5]imidazo[1,2-a]imidazole (bimbim), indolocarbazole, indolodibenzothiophene, indolodibenzofuran, indodibenzoselenophene, indolodibenzofluorene, naphthalene, germyl, boryl, amino, pyridine, pyridazine, pyrimidine, pyrazine, triazine, imidazole, benzimidazole, and aza variants thereof; and wherein the compound is not a metal-containing compound. Also provided are formulations, OLEDs and related consumer products that utilize these compounds.