Bipolar shell resurfaced perovskite quantum dots
US11535795B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 10, 2020 |
| Grant date | Dec 27, 2022 |
| Priority date | — |
| Expiry date | Nov 10, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/01
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Methods are disclosed to restore the halide ions lost in the purification (ligand removal) of photoluminescent cesium lead halide or FA lead halide perovskite quantum dots. Quantum dots thus prepared can be used to deposit solid films with high packing density featuring dots with <0.4 nm gaps therebetween, low trap density 1/40 of previously reported, high mobility 100× previously reported, high photoluminescent quantum yield exceeding 90%, high external quantum yield exceeding 20%, and increased stability under electrical current. The quantum dots are used to formulate inks suitable for ink jet printing, drop casting, spin coating, and other solution-based methods for forming emissive layers used in light producing semiconductor devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.