Invention Grant
- Patent Title: Bandpass filter for use in light emitting device and light emitting device using the same
- Patent Title (中): 用于发光器件的带通滤波器和使用其的发光器件
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Application No.: US14140379Application Date: 2013-12-24
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Publication No.: US09518718B2Publication Date: 2016-12-13
- Inventor: Daisuke Sanga , Tomonori Morizumi , Naoki Azuma , Keisuke Sejiki , Kunihito Sugimoto
- Applicant: NICHIA CORPORATION
- Applicant Address: JP Anan-Shi
- Assignee: NICHIA CORPORATION
- Current Assignee: NICHIA CORPORATION
- Current Assignee Address: JP Anan-Shi
- Agency: Foley & Lardner LLP
- Priority: JPP2012-287722 20121228
- Main IPC: F21V9/08
- IPC: F21V9/08 ; H01L25/075 ; H01L33/58 ; G02B5/28 ; H01L33/50

Abstract:
Provided is a bandpass filter for a light emitting device that can improve the light emission efficiency in use for a light emitting device, and a light emitting device that can obtain the high light emission efficiency by using the bandpass filter. The light emitting device includes a substrate; a light emitting element disposed over the substrate; a phosphor-containing layer containing at least one kind of phosphor; and a bandpass filter disposed over a surface of the phosphor-containing layer on the light emitting element side, the bandpass filter including a multilayer film having a plurality of first and second dielectric layers, the second dielectric layer being disposed over the first dielectric layer. The bandpass filter has a transmittance of 60% or more for light having a light emission peak wavelength of the light emitting element at an incident angle of 0 to 85°, and another transmittance of 40% or less for light having a light emission peak wavelength of at least one kind of phosphor at an incident angle of a Brewster's angle (θb)+5° (θb+5°) to 85° of the bandpass filter.
Public/Granted literature
- US20140185299A1 BANDPASS FILTER FOR USE IN LIGHT EMITTING DEVICE AND LIGHT EMITTING DEVICE USING THE SAME Public/Granted day:2014-07-03
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