公开(公告)号：US20160336477A1

公开(公告)日：2016-11-17

申请号：US15095001

申请日：2016-04-08

Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY

Inventor： Gyuweon Hwang ,  Donghun Kim ,  Jose M. Cordero ,  Mark W. B. Wilson ,  Chia-Hao M. Chuang ,  Jeffrey C. Grossman ,  Moungi G. Bawendi

IPC: H01L31/18 ,  H01L51/00 ,  H01L31/0445 ,  H01L31/036 ,  H01L31/032

CPC classification number: H01L31/18 ,  H01L31/0324 ,  H01L31/035218 ,  H01L31/036 ,  H01L31/0445 ,  H01L51/0001 ,  H01L51/0077 ,  H01L51/42 ,  H01L51/502

Abstract: The size-dependent band-gap tunability and solution processability of nanocrystals (NCs) make them attractive candidates for optoelectronic applications. One factor that presently limits the device performance of NC thin films is sub-bandgap states, also referred to as trap states. Trap states can be controlled by surface treatment of the nanocrystals.

Abstract translation: 纳米晶体（NC）的尺寸依赖带隙可调性和溶液可加工性使其成为光电子应用的有吸引力的候选者。 目前限制NC薄膜的器件性能的一个因素是子带隙状态，也称为陷阱状态。 陷阱状态可以通过纳米晶体的表面处理来控制。

公开(公告)号：US09944847B2

公开(公告)日：2018-04-17

申请号：US15045028

申请日：2016-02-16

Applicant: Massachusetts Institute of Technology

Inventor： Marc A. Baldo ,  Daniel N. Congreve ,  Nicholas John Thompson ,  Mark W. B. Wilson ,  Mengfei Wu ,  Moungi G. Bawendi ,  Vladimir Bulovic

IPC: G02F1/35 ,  C09K11/56 ,  G01J1/58 ,  G02F2/02

CPC classification number: C09K11/562 ,  G01J1/58

Abstract: The present invention generally relates to composition and methods for upconverting light. In some embodiments, the composition and methods comprise an organic material, a nanocrystal, and a ligand capable of facilitating energy transfer between the nanocrystal and the organic material. In certain embodiments, the nanocrystal has a first excited energy state with an energy greater than a triplet state of the organic material. The organic material, in some embodiments, may be aromatic and/or include one or more pi-conjugated carbon-carbon double bonds. In some cases, incident light may be absorbed by the nanocrystal to produce triplet excitons. The triplet excitons may then transfer from the nanocrystal to the organic material and undergo triplet-triplet annihilation, creating a singlet state of approximately twice the energy of the triplet exciton. In certain embodiments, the singlet state fluoresces, resulting in the formation of a high energy photon.

公开(公告)号：US10794771B2

公开(公告)日：2020-10-06

申请号：US15045011

申请日：2016-02-16

Applicant: Massachusetts Institute of Technology

Inventor： Daniel N. Congreve ,  Nicholas John Thompson ,  Mark W. B. Wilson ,  Mengfei Wu ,  Marc A. Baldo ,  Moungi G. Bawendi ,  Vladimir Bulovic

IPC: G01J9/00 ,  H01L51/50 ,  C09K11/66

Abstract: The present invention generally relates to composition and methods for downconverting light. In some embodiments, the composition and methods comprise an organic material, a nanocrystal, and a ligand capable of facilitating energy transfer between the organic material and the nanocrystal. In certain embodiments, the nanocrystal has a first excited energy state with an energy less than a triplet energy state of the organic material. The organic material, in some embodiments, may be aromatic and/or include one or more pi-conjugated carbon-carbon double bonds. In some cases, incident light may be absorbed by the organic material to produce two triplet excitons. The triplet excitons may then transfer to the nanocrystal via the ligand, where they can undergo recombination, resulting in the formation low energy photons.

公开(公告)号：US10109760B2

公开(公告)日：2018-10-23

申请号：US15095001

申请日：2016-04-08

Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY

Inventor： Gyuweon Hwang ,  Donghun Kim ,  Jose M. Cordero ,  Mark W. B. Wilson ,  Chia-Hao M. Chuang ,  Jeffrey C. Grossman ,  Moungi G. Bawendi

IPC: H01L31/18 ,  H01L31/036 ,  H01L31/032 ,  H01L31/0445 ,  H01L51/00 ,  H01L31/0352 ,  H01L51/42

Abstract: The size-dependent band-gap tunability and solution processability of nanocrystals (NCs) make them attractive candidates for optoelectronic applications. One factor that presently limits the device performance of NC thin films is sub-bandgap states, also referred to as trap states. Trap states can be controlled by surface treatment of the nanocrystals.