Composition for luminescent element, and luminescent element containing same
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Solution Overview
Problem
Existing light emitting devices suffer from insufficient suppression of initial deterioration.
Innovation Solution
A composition for light emitting devices is developed, containing a host material with an aromatic compound having a condensed ring skeleton and a guest material with an aromatic amine compound, where the total sodium atom content is limited to 400 ppb or less, thereby suppressing initial deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional compositions are used for light emitting devices, then device fabrication is straightforward, but initial deterioration is not sufficiently suppressed
Solution Approach 1:
The patent applies parameter changes by precisely controlling the sodium atom content parameter within the composition. By setting the sodium atom content to 400 ppb or less and controlling the ratio of aromatic compound to aromatic amine compound, the invention achieves suppressed initial deterioration while maintaining manageable composition control complexity through established analytical methods.
Solution Approach 2:
The patent uses composite materials by combining specific aromatic compounds with condensed ring skeletons and aromatic amine compounds in controlled ratios. This composite approach, with precise control of sodium atom content and compound ratios, resolves the contradiction by achieving improved reliability through material composition while keeping device complexity manageable through systematic material selection.
2Reliability
If sodium atom content is not controlled, then composition preparation is simpler, but initial deterioration increases
Solution Approach 1:
The patent applies parameter changes by establishing a specific range for sodium atom content (400 ppb or less) and controlling the ratio of aromatic compound to aromatic amine compound. This parameter control approach resolves the contradiction by achieving improved reliability through precise composition control while maintaining reasonable manufacturing precision through standard analytical techniques.
3Reliability
If specific aromatic compounds with condensed ring skeletons are used, then light emitting performance improves, but material selection becomes more restricted
Solution Approach 1:
The patent applies local quality by specifying particular structural characteristics (condensed ring skeleton with three or more benzene rings) for the aromatic compound and particular functional groups (aromatic amine) for the guest material. This localized structural requirement resolves the contradiction by achieving improved reliability through targeted molecular design while maintaining material selection flexibility within the defined structural categories.
Solution Approach 2:
The patent uses composite materials by combining aromatic compounds with specific condensed ring structures and aromatic amine compounds in controlled ratios. This composite approach resolves the contradiction by achieving improved reliability through targeted material combinations while maintaining adaptability through the systematic selection of compounds within the specified structural frameworks.
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 effectively reduces initial deterioration in light emitting devices, enhancing their performance and longevity.
Implementation Method 1
a wavelength conversion layer comprising a first phosphor and a second phosphor, wherein the first phosphor converts part of the blue light emitted by the blue light-emitting solid-state light source into green light
Implementation Method 2
the first phosphor converts part of the blue light emitted by the blue light-emitting solid-state light source into green light
Implementation Method 3
a light guide plate... configured to guide the light from the light source to the luminescent element
Data Source
AI summary
To provide a composition which is useful for production of a light emitting device of which initial deterioration is suppressed, and a light emitting device formed using the composition. A composition for light emitting device containing a host material and a guest material blended therein, wherein, the above-described host material contains an aromatic compound having a condensed ring skeleton in which only three or more benzene rings are condensed, the above-described guest material contains an aromatic amine compound, and the total amount of sodium atoms contained in the above-described host material and sodium atoms contained in the above-described guest material is 400 ppb by mass or less with respect to the total amount of the above-described host material and the above-described guest material.