Organic Light-Emitting Composition for Lower Driving Voltage
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Solution Overview
Problem
Existing light emitting devices fabricated using certain compositions do not have sufficiently low driving voltage.
Innovation Solution
A composition for light emitting devices is developed, containing a specific compound (A) represented by the formula (FH) and a compound (B) with a condensed hetero ring skeleton containing a boron atom and a nitrogen atom, where the molecular weights of compounds (A) and (B) satisfy specific relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a composition containing compound H1 and compound G1 is used, then the light emitting device can be fabricated, but the driving voltage is not sufficiently low
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weights of compounds (A) and (B) to satisfy specific mathematical relationships (400 ≤ MA + MB ≤ 2000 and 0.30 ≤ MA/(MA+MB) ≤ 0.70). This optimization of molecular weight parameters enables the composition to achieve both low driving voltage and reliable device performance, resolving the technical contradiction between energy efficiency and device reliability.
Solution Approach 2:
The patent uses composite materials by combining compound (A) with a condensed hetero ring skeleton containing boron and nitrogen atoms with compound (B) in specific molecular weight ratios. This composite composition approach allows the light emitting device to achieve improved electron hole recombination efficiency and lower driving voltage while maintaining stable device operation, thus resolving the contradiction between energy efficiency and reliability.
2Use of energy by moving object
If the molecular weights of compounds (A) and (B) are optimized to satisfy specific relationships, then low driving voltage is achieved, but the composition design becomes more complex
Solution Approach 1:
The patent establishes clear parameter ranges (400 ≤ MA + MB ≤ 2000 and 0.30 ≤ MA/(MA+MB) ≤ 0.70) that guide the selection of compounds (A) and (B). By defining these specific molecular weight parameters, the patent simplifies the composition design process while achieving low driving voltage, transforming a complex optimization problem into a systematic parameter selection approach.
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 composition enables the production of light emitting devices with lower driving voltage, improving their operational efficiency.
Implementation Method 1
Light emitting devices such as an organic electroluminescent device
Data Source
AI summary
A light emitting device having an anode, a cathode, and an organic layer disposed between the anode and the cathode and containing a composition is described. The composition contains a compound (A) represented by the formula (FH) and a compound (B) having a condensed hetero ring skeleton (b) containing a boron atom and a nitrogen atom in the ring, and the molecular weight (MA) of the compound (A) and the molecular weight (MB) of the compound (B) satisfy the formula (M1-1) and the formula (M2-1).