Perovskite Nanoparticle Composite for Pinhole-Free Light Emission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The formation of pinholes in semiconducting perovskite films leads to non-radiative current losses and low quantum efficiency in solid state light-emitting devices, due to difficulties in achieving uniform thin films.
Innovation Solution
Embedding semiconducting perovskite nanoparticles in a matrix or blend of a material with a wider band gap than the perovskite nanoparticles, which forms a pinhole-free charge-blocking layer, preventing non-radiative current losses and enhancing light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If semiconducting perovskite films are deposited using solution processing, then low-cost fabrication is achieved, but pinhole formation occurs leading to non-radiative current losses
Solution Approach 1:
The patent embeds semiconducting perovskite nanoparticles within an organic matrix material to form a composite structure. This composite approach allows the perovskite nanoparticles to provide the desired optoelectronic properties while the organic matrix fills gaps and prevents pinhole formation, thereby maintaining low-cost solution processing while achieving pinhole-free films with improved reliability
Solution Approach 2:
The patent changes the physical state and size parameters of the perovskite material by using nanoparticles instead of bulk films. This parameter change allows the material to be processed from solution at low cost while the nanoparticle morphology, when embedded in a matrix, prevents pinhole formation and eliminates non-radiative current losses
2Reliability
If pinhole-free perovskite films are achieved, then non-radiative current losses are prevented, but manufacturing complexity increases
Solution Approach 1:
By creating a composite of perovskite nanoparticles in an organic matrix, the patent achieves pinhole-free films through a relatively simple solution processing method. The self-assembly nature of nanoparticles in a matrix during solution drying provides the pinhole-free structure without requiring complex multi-step fabrication processes, thus maintaining low manufacturing complexity while achieving high current efficiency
3Loss of energy
If external quantum efficiency is increased by embedding perovskite nanoparticles in organic matrix, then light emission is enhanced, but material complexity increases
Solution Approach 1:
The patent uses a composite of perovskite nanoparticles and organic matrix materials that are both processable from solution. This composite structure enhances light emission and quantum efficiency by eliminating non-radiative recombination at pinholes, while the use of solution-processable materials keeps the overall device fabrication relatively simple, thus achieving high quantum efficiency without excessive material complexity
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
This approach significantly improves the quantum efficiency of light-emitting devices by reducing current density requirements and increasing external quantum efficiency by more than two orders of magnitude, while maintaining the electrical contact of perovskite crystals with injection layers.
Implementation Method 1
bright and colour-controlled electroluminescence was reported in perovskite light-emitting diodes (PeLED)
Implementation Method 2
Embedding semiconducting perovskite nanoparticles in a matrix or blend of a material with a wider band gap than the perovskite nanoparticles, which forms a pinhole-free charge-blocking layer
Data Source
AI summary
Broadly speaking, embodiments of the present invention provide a solid state light-emitting device and a method of manufacturing the solid state light-emitting device. The method comprises preparing a thin layer of semiconducting perovskite nanoparticles embedded in a matrix or blend of a material that has a wider band gap than the semiconducting perovskite nanoparticles. In embodiments, the method comprises blending a solution of a semiconducting perovskite material or a precursor therefor with a solution of a material that has a wider band gap than the semiconducting perovskite material or a precursor therefor followed by removal of the solvent from the mixture thus formed, to give the semiconducting perovskite nanoparticles embedded in a matrix or blend of the material that has a wider band gap than the semiconducting perovskite nanoparticles.