LIGHT-EMITTING APPARATUS

• US 20150155460A1
• Filed: 11/25/2014
• Published: 06/04/2015
• Est. Priority Date: 11/29/2013
• Status: Abandoned Application

• Current Assignee: Citizen Watch Co Limited (Citizen Electronics Company Limited)
• Original Assignee: Citizen Electronics Company Limited, Citizen Holdings Co., Ltd.
• Inventors: Fukasawa, Koichi
• Application Number:
  US14/552,787
• Publication Number:
  US 20150155460A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01L 2224/48137 the bodies being arranged next to each other, e.g. on a common substrate
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/08 with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body H01L27/15 takes precedence
• CPC Class Codes: H01L 33/32 containing nitrogen
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/56 Materials, e.g. epoxy or silicone resin
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

A light-emitting apparatus that can produce white light that appears crisper by controlling light-emitting devices of different colors using a simplified wiring configuration is provided. The light-emitting apparatus includes a plurality of blue-emitting devices as blue-emitting semiconductor light-emitting devices, a plurality of green-emitting devices as green-emitting semiconductor light-emitting devices, and a sealing resin through which is dispersed a red phosphor that emits red light by absorbing blue light from the plurality of blue-emitting devices and green light from the plurality of green-emitting devices as pump light, the sealing resin covering the plurality of blue-emitting devices and the plurality of green-emitting devices, wherein the plurality of blue-emitting devices and the plurality of green-emitting devices are connected in series with each other.

Claims

1. A light-emitting apparatus comprising:

a plurality of blue-emitting devices as blue-emitting semiconductor light-emitting devices;

a plurality of green-emitting devices as green-emitting semiconductor light-emitting devices; and

a sealing resin through which is dispersed a red phosphor that emits red light by absorbing blue light from the plurality of blue-emitting devices and green light from the plurality of green-emitting devices as pump light, the sealing resin covering the plurality of blue-emitting devices and the plurality of green-emitting devices, wherein

the plurality of blue-emitting devices and the plurality of green-emitting devices are connected in series with each other.

2. The light-emitting apparatus according to claim 1, wherein the plurality of blue-emitting devices and the plurality of green-emitting devices are both InGaN-based semiconductor light-emitting devices.

3. The light-emitting apparatus according to claim 1, wherein the plurality of blue-emitting devices and the plurality of green-emitting devices are grouped into a plurality of columns which are then connected in parallel with each other on a single substrate, and wherein in each of the plurality of columns, a plurality of the blue-emitting devices and a plurality of the green-emitting devices are connected in series with each other.

4. The light-emitting apparatus according to claim 3, wherein the ratio of the number of the plurality of blue-emitting devices to the number of the plurality of green-emitting devices contained in each of the plurality of columns is the same for all of the columns.