公开(公告)号：US20250048792A1

公开(公告)日：2025-02-06

申请号：US18927581

申请日：2024-10-25

Applicant: EPISTAR CORPORATION

Inventor： Heng-Ying CHO ,  Li-Yu SHEN ,  Yu-Yi HUNG ,  Chen OU ,  Li-Ming CHANG

IPC: H01L33/20 ,  H01L27/15 ,  H01L33/10 ,  H01L33/38

Abstract: A light-emitting device including a semiconductor stack generating a first light, and a filter formed on the semiconductor stack, including a first surface facing the semiconductor stack and a second surface opposite to the first surface. The filter includes pairs of layers with different refractive indexes alternately stacked. A portion of the first light is transmitted by the filter. The light emitting device emits a second light including the portion of the first light, and the second light includes a first directional part with a first FWHM and a second directional part with a second FWHM smaller than the first FWHM. The first directional part has a first angle with a normal direction of the second surface in a range of 45-90 degrees and the second directional part having a second angle with the normal direction of the second surface in a range of 0-30 degrees.

公开(公告)号：US20220037556A1

公开(公告)日：2022-02-03

申请号：US17389467

申请日：2021-07-30

Applicant: EPISTAR CORPORATION

Inventor： Heng-Ying CHO ,  Li-Yu SHEN ,  Yu-Yi HUNG ,  Chen OU ,  Li-Ming CHANG

IPC: H01L33/20 ,  H01L33/10 ,  H01L27/15 ,  H01L33/38

Abstract: A light-emitting device, including: a semiconductor stack generating a first light; and a filter formed on the stack, including a first surface facing the stack and a second surface opposite to the first surface. The filter includes pairs of layers with different refractive indexes alternately stacked, and a portion of the first light is transmitted by the filter. The light emitting device emits a second light including the portion of the first light, and the second light includes a first directional part with a first FWHM and a second directional part with a second FWHM. The first directional part has a first angle with a normal direction of the second surface in a range of 45-90 degrees, the second directional part has a second angle with the normal direction of the second surface in a range of 0-30 degrees, and the second FWHM is smaller than the first FWHM.

公开(公告)号：US20210408338A1

公开(公告)日：2021-12-30

申请号：US17354922

申请日：2021-06-22

Applicant: EPISTAR CORPORATION

Inventor： Heng-Ying CHO ,  Li-Yu SHEN ,  Chih-Hao CHEN ,  Keng-Lin CHUANG

IPC: H01L33/44 ,  H01L33/10

Abstract: A light-emitting device comprises a semiconductor stack emitting a light with a peak wavelength λ; and a light field adjustment layer formed on the semiconductor stack, wherein the light field adjustment layer comprises a plurality of first layers and a plurality of second layers alternately stacked on top of each other, the plurality of first layers each comprises a first optical thickness, and the plurality of second layers each comprises a second optical thickness.