Organic Light-Emitting Device With Platinum Emitter and Amine-Free Capping Layer
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Solution Overview
Problem
Current organic light-emitting devices face limitations in efficiency and performance due to suboptimal emission layer and capping layer compositions, particularly in achieving high color purity and luminescence efficiency.
Innovation Solution
Incorporating an emission layer with a platinum-based emitter and a capping layer containing an amine-free compound or a condensed cyclic compound, optimized to have specific energy levels and refractive indices, within the organic light-emitting device structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional emission layer and capping layer compositions are used, then device structure is simple, but luminescence efficiency and color purity are insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the emission layer by using platinum-based emitters with specific HOMO energy levels (−4.4 eV or less) and modifies the capping layer by eliminating amine compounds. These parameter changes resolve the contradiction by achieving high luminescence efficiency and color purity while maintaining reasonable manufacturing simplicity.
Solution Approach 2:
The patent employs composite material design by combining platinum-based emitter compounds with specific organic ligands in the emission layer, and using condensed cyclic compounds in the capping layer. This composite approach enables simultaneous optimization of luminescence efficiency, color purity, and device stability without excessive manufacturing complexity.
2Ease of manufacture
If amine-containing compounds are used in the capping layer, then ease of manufacture is improved, but color purity and luminescence efficiency deteriorate
Solution Approach 1:
The patent applies the extraction principle by removing amine-containing compounds from the capping layer composition. This elimination of harmful components (amines that cause quenching) directly improves color purity and luminescence efficiency while the capping layer remains manufacturable using alternative condensed cyclic compounds.
Solution Approach 2:
The patent creates an inert environment in the capping layer by using condensed cyclic compounds that do not contain amine groups, which are known to quench luminescence. This inert chemical environment protects the emission layer and enables high color purity without complicating the manufacturing process.
3Productivity
If platinum-based emitter with optimized HOMO energy level is used, then luminescence efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent specifies a clear parameter threshold for the HOMO energy level of platinum-based emitters (−4.4 eV or less), which provides a straightforward selection criterion for materials. This parameter-based approach simplifies the complexity by giving manufacturers a specific target value rather than requiring optimization of multiple variables.
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 solution enhances the organic light-emitting device's efficiency and color purity by optimizing the emission layer and capping layer compositions, leading to improved luminescence performance.
Implementation Method 1
The first emitter may be to emit blue light, the first emitter may include platinum (Pt)... Carriers, such as holes and electrons, recombine in the emission layer to produce excitons. The excitons may transition and relax from an excited state to a ground state, thus generating light.
Implementation Method 2
the emission layer may include an organometallic compound represented by Formula 1... wherein M11 may be platinum (Pt), palladium (Pd), copper (Cu), silver (Ag), gold (Au), rhodium (Rh), ruthenium (Ru), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb), or thulium (Tm)
Data Source
AI summary
An organic light-emitting device includes: a first electrode, a second electrode facing the first electrode, an interlayer which is between the first electrode and the second electrode and including an emission layer, and a capping layer located outside the first electrode or the second electrode, where the emission layer includes a first emitter, the first emitter is to emit blue light, the first emitter includes platinum (Pt), the highest occupied molecular orbital (HOMO) energy level of the first emitter is −4.4 eV or less, and the capping layer includes an amine-free compound.