Organic Light-Emitting Composition to Limit Self-Absorption Loss
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Solution Overview
Problem
Existing light emitting devices fabricated using certain compositions exhibit insufficient external quantum efficiency.
Innovation Solution
A light emitting device comprising an organic layer with a composition containing two or more compounds (B) having a condensed hetero ring skeleton with a boron atom and a nitrogen atom, where the compounds satisfy specific relations regarding their emission and absorption spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a composition containing compound H1 and compound G1 is used, then the light emitting device can be fabricated, but the external quantum efficiency is insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of the light emitting compounds by introducing specific condensed hetero ring skeletons containing boron and nitrogen atoms, and by controlling the relationship between emission and absorption spectra (EB-AB≤100nm), thereby improving external quantum efficiency without significantly increasing device complexity
Solution Approach 2:
The patent uses composite light emitting compositions containing multiple compounds with specific structural features (condensed hetero ring skeletons with boron and nitrogen), where the compounds work synergistically to achieve high external quantum efficiency while maintaining manageable composition structure
2Reliability
If compounds with condensed hetero ring skeleton containing boron and nitrogen are used, then external quantum efficiency is improved, but self-absorption occurs
Solution Approach 1:
The patent carefully controls the spectral parameters by selecting compounds where the difference between emission peak wavelength (EB) and absorption peak wavelength (AB) is 100nm or less, which optimizes the balance between achieving high external quantum efficiency and minimizing self-absorption losses
Solution Approach 2:
The patent converts the potential harmful effect of self-absorption into a beneficial mechanism by using compounds with specific spectral characteristics where the absorption spectrum overlaps with the emission spectrum, enabling efficient energy transfer and reducing wasted energy through controlled self-absorption
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 proposed solution enhances the external quantum efficiency of light emitting devices by optimizing the interaction between the compounds, reducing self-absorption, and improving electrical interaction.
Implementation Method 1
a light emitting device comprising an anode, a cathode, and an organic layer disposed between the anode and the cathode and containing a composition for light emitting device
Implementation Method 2
the peak wavelength at the lowest energy side of an absorption spectrum in the ultraviolet-visible region
Data Source
AI summary
A light emitting device including an anode, a cathode, and an organic layer disposed between the anode and the cathode and containing a composition is provided. The composition contains two or more compounds (B) having a condensed hetero ring skeleton (b) containing a boron atom and a nitrogen atom in the ring. Compound (B) contains a compound (B1) and a compound (B2) which satisfy at least one of the following formulas: EB1<EB2 and AB1<AB2. EB1 represents the maximum peak wavelength of the emission spectrum at 25° C. of compound (B1), EB2 represents the maximum peak wavelength of the emission spectrum at 25° C. of compound (B2), AB1 represents the peak wavelength at the lowest energy side of the absorption spectrum at 25° C. of compound (B1), and AB2 represents the peak wavelength at the lowest energy side of the absorption spectrum at 25° C. of compound (B2).