Huawei Technologies Co., Limited

University of Toronto

Huawei Technologies Canada Co., Ltd.

Quan Lyu

Edward Hartley Sargent

Sjoerd Hoogland

Makhsud I Saidaminov

Giovanni Francesco Cotella

Peter Chun

Ya-Kun Wang

Yitong Dong

Fanglong Yuan

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 &#x3c;0.4 nm gaps therebetween, low trap density 1/40 of previously reported, high mobility 100&#xd7; 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.

Bipolar shell resurfaced perovskite quantum dots

Embodiments of this application disclose a light-emitting diode chip and a preparation method therefor. The chip includes: an N-type GaN doping layer; three sub-pixel structures respectively formed in three sub-pixel regions at a first surface of the N-type GaN doping layer, where each of the three sub-pixel structures includes a blue-light quantum well structure, an interface barrier layer, a green-light quantum well structure, a charge barrier layer, and a P-type GaN doping layer that grow in sequence; three P-type contact electrodes respectively formed on the three sub-pixel structures, and an N-type contact electrode formed in a remaining region other than the three sub-pixel regions at the first surface of the N-type GaN doping layer; and a red-light colloidal quantum dot structure formed in a region that corresponds to a first sub-pixel region in the three sub-pixel regions and that is at a second surface of the N-type GaN doping layer.

Light-emitting diode chip and preparation method therefor

Growing community of inventors

Ipswich, United Kingdom

Quan Lyu