Platinum Emitter Light-Device Low Voltage Efficiency

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Solution Overview

Problem

Conventional light-emitting devices face challenges in achieving low driving voltage and high power efficiency while maintaining suitable emission spectra and recombination balance of electrons and holes.

Innovation Solution

A light-emitting device is designed with an interlayer comprising an emission layer and an electron transport region, where the emission layer includes a platinum-based emitter with a triplet metal-to-ligand charge transfer state of 7% or more, and the electron transport region incorporates a heterocyclic compound with specific moieties, optimizing the emission spectrum and electron transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by stationary object

If conventional light-emitting devices use traditional emitters and electron transport materials, then the device structure is simple, but the driving voltage is high and power efficiency is low

Engineering Contradiction:

Improvepower efficiencyVSAvoidemitter and electron transport region composition

Core Design Contradiction:

Use of energy by stationary objectVSDevice complexity

Solution Approach 1:

The patent changes the chemical composition parameters of the emitter and electron transport materials. Specifically, it uses a platinum-based emitter with a triplet metal-to-ligand charge transfer state of 7% or more, combined with a heterocyclic compound in the electron transport region. This parameter optimization enables low driving voltage and high power efficiency while maintaining device performance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material design by combining a platinum-based emitter with specific heterocyclic compounds (containing diazine, triazine groups) in the electron transport region. This composite approach creates synergistic effects that improve electron transport and recombination balance, achieving high power efficiency without excessive structural complexity.

Inventive Principle:

Principle #40Composite materials

2Reliability

If conventional devices use standard emitters, then the emission spectrum is general, but the recombination balance of electrons and holes is poor

Engineering Contradiction:

Improverecombination balanceVSAvoidemitter configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent optimizes the triplet metal-to-ligand charge transfer state parameter of the platinum-based emitter to be 7% or more. This specific parameter range ensures proper balance between electron and hole recombination, improving device reliability. The heterocyclic compound in the electron transport region further fine-tunes this balance through its molecular structure.

Inventive Principle:

Principle #35Parameter changes

3Illumination intensity

If devices aim for high performance, then emission spectrum quality improves, but driving voltage increases

Engineering Contradiction:

Improveemission spectrum qualityVSAvoiddriving voltage

Core Design Contradiction:

Illumination intensityVSPower

Solution Approach 1:

The heterocyclic compound in the electron transport region acts as an intermediary between the platinum-based emitter and the electrodes. It facilitates efficient electron transport and energy transfer, enabling high emission spectrum quality to be achieved at low driving voltage. The specific molecular structure (with diazine/triazine groups) optimizes this intermediary function.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 device achieves low driving voltage, high power efficiency, and improved recombination balance, enabling the production of high-quality electronic devices with enhanced display quality and reduced power consumption.

Implementation Method 1

a triplet metal-to-ligand charge transfer state (3MLCT) of the first emitter is 7% or more

Methodology Applied

Scientific EffectMetal-to-ligand charge transfer (MLCT):

Implementation Method 2

the first emitter may be configured to emit first light having a first emission spectrum

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 3

the electron transport region may include a heterocyclic compound

Methodology Applied

Scientific EffectElectron transport: Conduction (electrical)

Implementation Method 4

Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. These excitons transition (e.g., decay) from an excited state to a ground state to thereby generate light.

Methodology Applied

Scientific EffectCarrier recombination:

Data Source

PatentUS20240023361A1Light-emitting device, electronic device including the same, and electronic apparatus includuing the same

Publication Date: 2024.01.18 SAMSUNG DISPLAY CO LTD

AI summary

An electronic device including the light-emitting device, and a consumer product including the light-emitting device. The light-emitting device includes a first electrode, a second electrode facing the first electrode, and an interlayer between the first electrode and the second electrode, wherein the interlayer includes an emission layer and an electron transport region, wherein the electron transport region is between the emission layer and the second electrode, and the emission layer includes a first emitter, and the electron transport region includes a heterocyclic compound. The descriptions of the first emitter and the heterocyclic compound are the same as described in the present specification.