公开(公告)号：US20230139185A1

公开(公告)日：2023-05-04

申请号：US17765361

申请日：2021-12-10

Applicant: Massachusetts Institute of Technology

Inventor： Rajeev J. RAM ,  Jaehwan Kim ,  Jin Xue ,  Zheng Li

IPC: H01L27/15

Abstract: Light-emitting diodes having radiative recombination regions with deep sub-micron dimensions are described. The LEDs can be fabricated from indirect bandgap semiconductors and operated under forward bias conditions to produce intense light output from the indirect bandgap material. The light output per unit emission area can be over 500 W cm−2, exceeding the performance of even high brightness gallium nitride LEDs.

公开(公告)号：US11756983B2

公开(公告)日：2023-09-12

申请号：US17765361

申请日：2021-12-10

Applicant: Massachusetts Institute of Technology

Inventor： Rajeev J. Ram ,  Jaehwan Kim ,  Jin Xue ,  Zheng Li

IPC: H01L27/15

CPC classification number: H01L27/156

Abstract: Light-emitting diodes having radiative recombination regions with deep sub-micron dimensions are described. The LEDs can be fabricated from indirect bandgap semiconductors and operated under forward bias conditions to produce intense light output from the indirect bandgap material. The light output per unit emission area can be over 500 W cm−2, exceeding the performance of even high brightness gallium nitride LEDs.

公开(公告)号：US11698301B2

公开(公告)日：2023-07-11

申请号：US17335299

申请日：2021-06-01

Applicant: Massachusetts Institute of Technology

Inventor： Rajeev J. Ram ,  Amir H. Atabaki ,  Nili Persits ,  Jaehwan Kim

IPC: G01J3/02 ,  G01N21/65 ,  G01J3/44 ,  G02B6/42

CPC classification number: G01J3/0218 ,  G01J3/4412 ,  G01N21/65 ,  G01N2201/06113 ,  G02B6/4206

Abstract: Swept-source Raman spectroscopy uses a tunable laser and a fixed-wavelength detector instead of a spectrometer or interferometer to perform Raman spectroscopy with the throughput advantage of Fourier transform Raman spectroscopy without bulky optics or moving mirrors. Although the tunable laser can be larger and more costly than a fixed wavelength diode laser used in other Raman systems, it is possible to split and switch the laser light to multiple ports simultaneously and/or sequentially. Each site can be monitored by its own fixed-wavelength detector. This architecture can be scaled by cascading fiber switches and/or couplers between the tunable laser and measurement sites. By multiplexing measurements at different sites, it is possible to monitor many sites at once. Moreover, each site can be meters to kilometers from the tunable laser. This makes it possible to perform swept-source Raman spectroscopy at many points across a continuous flow manufacturing environment with a single laser.