Nitrogen-Boron Spiro Heterocycles for Fast, Bright Emission

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Solution Overview

Problem

Existing light-emitting devices face challenges in achieving optimal performance in terms of luminance, driving voltage, and response speed, particularly in incorporating heterocyclic compounds that enhance these characteristics.

Innovation Solution

A light-emitting device is designed with a heterocyclic compound featuring an electron donor moiety with nitrogen, an electron acceptor moiety with boron, and a spiro core atom, bonded via specific single bonds, which forms part of the emission layer, enhancing the device's performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If conventional emission layer materials are used, then device structure is simple, but luminance and response speed are insufficient

Engineering Contradiction:

ImproveluminanceVSAvoidcompound structure complexity

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The patent employs composite heterocyclic compounds containing multiple functional moieties (electron donor, electron acceptor, spiro core) within a single molecular structure. This composite approach enables the material to simultaneously provide high luminance through efficient carrier recombination and maintain structural integrity for device fabrication, resolving the contradiction between performance enhancement and structural complexity.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention introduces specific functional groups (nitrogen-containing electron donor, boron-containing electron acceptor) at localized positions within the heterocyclic compound structure. This local functionalization allows different regions of the molecule to perform specialized functions (hole injection, electron injection, recombination) thereby achieving high luminance without requiring complex overall device architecture.

Inventive Principle:

Principle #3Local quality

2Speed

If high-performance heterocyclic compounds are incorporated, then luminance and response speed improve, but driving voltage increases

Engineering Contradiction:

Improveresponse speedVSAvoiddriving voltage

Core Design Contradiction:

SpeedVSUse of energy by stationary object

Solution Approach 1:

The patent optimizes the molecular parameters of the heterocyclic compound including HOMO-LUMO energy level alignment, carrier mobility, and recombination efficiency. By carefully tuning these parameters through molecular design (selecting specific electron donor/acceptor combinations and spiro core configurations), the material achieves fast response speed while maintaining driving voltage within acceptable ranges through optimized energy level matching between adjacent layers.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If complex heterocyclic compounds with specific bonding patterns are used, then emission performance improves, but manufacturing difficulty increases

Engineering Contradiction:

Improveemission performanceVSAvoidcompound synthesis ease

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The heterocyclic compound is designed as a segmented molecular structure composed of distinct functional modules (electron donor moiety, electron acceptor moiety, spiro core atom) that can be synthesized separately and then coupled through well-established organic synthesis methods. This segmentation strategy enables reliable emission performance through precise molecular design while facilitating manufacturing through modular synthesis approaches.

Inventive Principle:

Principle #1Segmentation

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 heterocyclic compound improves luminance, driving voltage, and response speed, making the device more efficient and effective.

Implementation Method 1

Carriers, such as the holes and electrons, recombine in the emission layer to produce excitons. The excitons transition from an excited state to a ground state to thereby generate light.

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS20250275473A1Light-emitting device including heterocyclic compound, electronic apparatus and electronic equipment including the light-emitting device, and the heterocyclic compound

Publication Date: 2025.08.28 SAMSUNG DISPLAY CO LTD

AI summary

Embodiments provide a heterocyclic compound, a light-emitting device including the heterocyclic compound, an electronic apparatus including the light-emitting device, and an electronic equipment including the light-emitting device. The heterocyclic compound includes an electron donor moiety including nitrogen, an electron acceptor moiety including boron, and a spiro core atom, wherein the spiro core atom is bonded to the electron donor moiety via a first bond and a second bond, and the spiro core atom is bonded to the electron acceptor moiety via a third bond and a fourth bond. The first bond, the second bond, the third bond, and the fourth bond are each a single bond, and the heterocyclic compound satisfies at least one of Conditions 1 to 3, which are explained in the specification.