OLED Emission Layer Compounds for Near-Infrared Light Output
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic light-emitting devices (OLEDs) face limitations in emitting light in the near-infrared region effectively, which hampers their applications in advanced imaging and sensing technologies.
Innovation Solution
Incorporating a condensed cyclic compound represented by Formula 1 into the emission layer of OLEDs, which includes specific carbocyclic and heterocyclic groups, allows for efficient emission of light in the near-infrared region with a maximum wavelength of 680 nanometers or greater.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional organic light-emitting devices are used, then they can emit light in the visible region with good efficiency, but they cannot effectively emit light in the near-infrared region
Solution Approach 1:
The patent modifies the molecular structure of the emission layer by incorporating condensed cyclic compounds with specific carbocyclic and heterocyclic groups (Formula 1), which changes the optical properties of the material to enable near-infrared emission. This structural parameter change allows the OLED to emit light with a maximum wavelength of 680 nm or greater, extending into the near-infrared region while maintaining emission efficiency
Solution Approach 2:
The emission layer is designed as a composite material system comprising the condensed cyclic compound (Formula 1) combined with specific host materials and dopants. This composite structure enables effective near-infrared light emission by leveraging the synergistic properties of different materials, including the unique optical characteristics of the condensed cyclic compound framework
2Illumination intensity
If the emission layer is modified to emit near-infrared light, then near-infrared emission capability is improved, but driving voltage may increase
Solution Approach 1:
The patent optimizes the molecular parameters of the condensed cyclic compound (Formula 1), including the selection of specific carbocyclic and heterocyclic groups and their substitution patterns, to achieve near-infrared emission while controlling the energy levels. By carefully adjusting these molecular parameters, the device achieves 680 nm or greater maximum wavelength emission without significant increases in driving voltage
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 the condensed cyclic compound enhances OLEDs' capability to emit near-infrared light, improving their performance in imaging and sensing applications without significantly increasing driving voltage.
Implementation Method 1
Holes provided from the first electrode may move toward the emission layer through the hole transport region. Electrons provided from the second electrode may move toward the emission layer through the electron transport region. Carriers, such as holes and electrons, may recombine in the emission layer to produce excitons. These excitons transit (e.g., transition or relax) from an excited state to a ground state to thereby generate light.
Data Source
AI summary
Provided are an organic light-emitting device including a first electrode; a second electrode facing the first electrode; and an organic layer between the first electrode and the second electrode and including an emission layer, wherein the emission layer may include at least one condensed cyclic compound represented by Formula 1 and emit light in a near-infrared (NIR) region having a maximum emission wavelength of 680 nanometers (nm) or greater: