Light-Emitting Device Organic Layer Heat Resistance
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Solution Overview
Problem
Conventional light-emitting devices face challenges in achieving high heat resistance and reliability while maintaining carrier-transport properties, as increasing molecular weight or introducing fused rings can impair these properties.
Innovation Solution
Incorporating specific organic compounds with bicarbazole and heteroaromatic ring skeletons, such as benzofuropyrimidine, into the light-emitting device structure to enhance glass transition temperature without compromising carrier-transport properties, thereby improving heat resistance and device reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If molecular weight is increased or fused rings are introduced to improve heat resistance, then glass transition temperature increases, but carrier-transport properties deteriorate
Solution Approach 1:
The patent changes the chemical structure parameters of the organic compound by introducing specific skeletons (bicarbazole combined with heteroaromatic rings such as pyridine, diazine, or triazine) to achieve high glass transition temperature while preserving carrier-transport properties through careful molecular design
Solution Approach 2:
The patent creates a composite molecular structure by combining bicarbazole skeleton with heteroaromatic ring skeletons, achieving synergistic effects where the composite structure provides both high thermal stability and good electrical properties that neither component alone could achieve
2Reliability
If conventional organic compounds are used to maintain carrier-transport properties, then device operation is preserved, but heat resistance is insufficient
Solution Approach 1:
The patent modifies the thermal parameters of the organic compound by incorporating rigid bicarbazole and heteroaromatic ring structures, raising the glass transition temperature to enhance heat resistance while maintaining the electronic properties necessary for carrier transport
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 use of these organic compounds allows for a light-emitting device with high heat resistance and reliable performance, maintaining efficient carrier transport and emission efficiency even under thermal treatment, thus addressing the limitations of existing devices.
Implementation Method 1
enhance glass transition temperature without compromising carrier-transport properties, thereby improving heat resistance
Implementation Method 2
Light-emitting devices (organic EL devices) including organic compounds and utilizing electroluminescence (EL) have been put to practical use. Carriers are injected by application of voltage to the device, and recombination energy of the carriers is used, whereby light emission can be obtained from the light-emitting material.
Data Source
AI summary
A light-emitting device with high resistance to heat in a fabrication process is provided. The light-emitting device includes an EL layer between an anode and a cathode, and the EL layer includes at least a light-emitting layer. The light-emitting device includes, between the light-emitting layer and the cathode, a first layer in contact with the light-emitting layer. The light-emitting layer includes a light-emitting substance, a first organic compound, and a second organic compound. The first layer includes a third organic compound different from the first organic compound and the second organic compound. The light-emitting substance emits green to yellow light. The third organic compound includes a bicarbazole skeleton and a heteroaromatic ring skeleton including one selected from a pyridine ring, a diazine ring, and a triazine ring.