Perovskite Compound Quantum Yield Optimization
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Solution Overview
Problem
The quantum yield of compounds with a perovskite type crystal structure, as described in Non-Patent Document 1, is insufficient for use in light-emitting devices and displays.
Innovation Solution
A compound with a perovskite type crystal structure is developed, specifically designed to have a unit cell volume of 0.2000 nm^3 or more and 0.2150 nm^3 or less, with ionic radii of B and X within specific ranges, and containing A as a monovalent cation, B as a metal ion, and X as a halide ion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a perovskite type crystal structure is used as a light-emitting material, then the material can be synthesized and processed, but the quantum yield is insufficient for practical use in light-emitting devices and displays
Solution Approach 1:
The patent applies parameter changes by precisely controlling the unit cell volume (0.2000-0.2150 nm³) and ionic radii of components (B: 0.7-1.4 Å, X: 0.5-2.5 Å) to optimize the perovskite crystal structure. This systematic parameter optimization resolves the contradiction by achieving high quantum yield (improving reliability) while maintaining synthesizability through defined compositional ranges (ease of manufacture).
Solution Approach 2:
The patent employs composite materials by combining specific monovalent cations (A), metal ions (B), and halide ions (X) in a controlled perovskite structure. The use of composite perovskite materials with optimized compositional ratios enables simultaneous achievement of high quantum yield and practical processability, resolving the contradiction between reliability and ease of manufacture.
2Reliability
If the unit cell volume and ionic radii are optimized within specific ranges, then the quantum yield increases, but the synthesis precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges (unit cell volume: 0.2000-0.2150 nm³, ionic radius of B: 0.7-1.4 Å, ionic radius of X: 0.5-2.5 Å) that balance quantum yield optimization with achievable synthesis precision. By establishing these concrete parameter boundaries, the patent resolves the contradiction between high reliability (quantum yield) and manufacturing precision requirements.
3Ease of manufacture
If conventional perovskite compounds are used, then the material synthesis is straightforward, but the emission characteristics are insufficient for high-performance light-emitting devices
Solution Approach 1:
The patent optimizes emission characteristics by controlling crystal structure parameters (unit cell volume and ionic radii) while maintaining synthetic feasibility. This parameter optimization approach resolves the contradiction between ease of manufacture and illumination intensity by finding the optimal balance point in the perovskite structure.
Solution Approach 2:
The patent develops composite perovskite materials with specific compositional ratios of monovalent cations, metal ions, and halide ions to enhance emission characteristics. This composite material strategy enables simultaneous achievement of straightforward synthesis and improved illumination intensity, resolving the technical contradiction.
Data Source
AI summary
A compound has a perovskite type crystal structure containing A which is a monovalent cation, B which is a metal ion, and X which is a halide ion as components. The perovskite type crystal structure has a unit cell volume of 0.2000 nm3 or more and 0.2150 nm3 or less, an ionic radius of B of 0.7 Å or more and 1.4 Å or less, and an ionic radius of X of 0.5 Å or more and 2.5 Å or less.