Polymer Host Material for Phosphorescent OLED Luminance Life
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Solution Overview
Problem
The luminance life of light emitting devices using polymer compounds as host materials for phosphorescent compounds is not sufficiently long.
Innovation Solution
A polymer compound with specific repeating units, including alkyl, aryl, and aromatic heterocyclic groups, is developed to enhance the luminance life of light emitting devices, particularly in the blue emission range, by forming a composition with a phosphorescent compound and incorporating a solvent for a liquid composition and an organic film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
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If conventional polymer compounds are used as host materials for phosphorescent compounds, then the light emitting device can be produced with existing materials, but the luminance life is not sufficiently long
Solution Approach 1:
The patent modifies the chemical structure parameters of the host material by introducing specific substituents (formula 1a-1c) at defined positions (2-position and 5-position of 1,4-phenylene) to optimize the polymer compound's properties for extended luminance life and improved reliability
Solution Approach 2:
The patent creates a composite system by combining the specifically structured polymer compound (host material) with phosphorescent compounds, where the host material's optimized structure enhances the overall device performance and luminance life
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 polymer compound significantly improves the luminance life and current efficiency of light emitting devices, offering excellent stability and efficiency in blue light emission.
Implementation Method 1
a composition prepared by doping a host material with a phosphorescent compound showing light emission from a triplet excited state
Data Source
AI summary
A polymer compound has a repeating unit represented by general formula (1):wherein R1a represents an alkyl group, an aryl group, a monovalent aromatic heterocyclic group or an aralkyl group, each possibly substituted and the same or different; and X1a represents a group selected from formulae (1a) to (1c).]wherein R1c represents an aryl group or a monovalent aromatic heterocyclic group, possibly substituted; and R1d to R1f represent each independently an alkyl group, an aryl group, a monovalent aromatic heterocyclic group, an alkoxy group, an aryloxy group, an aralkyl group, an arylalkoxy group, a substituted amino group, a substituted carbonyl group, a substituted carboxyl group, a fluorine atom or a cyano group; and the pairs R1d and R1e, R1f and R1g, R1d and R1f, and R1e and R1g may be mutually linked to form a ring together with a carbon atom to which they are linked.