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Light Emitting Device And Projector
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A light-emitting device and a technology for a light-emitting layer, which can be used in projection devices, printing devices, focusing devices, etc., and can solve problems such as the decline in luminous efficiency
Pending Publication Date: 2020-10-09
SEIKO EPSON CORP +1
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When surface recombination occurs on the side of the light-emitting layer, the luminous efficiency drops
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no. 2 Embodiment approach
[0119] 2.1. Lighting device
[0120] Next, a light emitting device according to a second embodiment will be described with reference to the drawings. Figure 8 It is a cross-sectional view schematically showing the light emitting device 200 of the second embodiment. Figure 9 It is a cross-sectional view schematically showing the columnar portion 30 of the light emitting device 200 according to the second embodiment. Hereinafter, in the light-emitting device 200 according to the second embodiment, components having the same functions as those of the components of the light-emitting device 100 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0121] Such as Figure 8 and Figure 9 As shown, the first guiding layer 33 , the light emitting layer 34 , the third semiconductor layer 38 , the second guiding layer 35 , and the second semiconductor layer 36 of the light emitting device 200 according to t...
no. 3 Embodiment approach
[0130] Next, a projector according to a third embodiment will be described with reference to the drawings. Figure 10 It is a figure which schematically shows the projector 900 of 3rd Embodiment.
[0131] Projector 900 includes, for example, light emitting device 100 as a light source.
[0132] The projector 900 has a housing (not shown), and a red light source 100R, a green light source 100G, and a blue light source 100B arranged in the housing to emit red light, green light, and blue light, respectively. Also, for convenience, in Figure 10 In , the red light source 100R, the green light source 100G, and the blue light source 100B are simplified.
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Abstract
There are provided a light emitting device and a projector which can reduce surface compounding. The light emitting device includes a substrate; a laminated structure provided on the substrate and having a plurality of columnar portions, in which the columnar portion includes an n-type first semiconductor layer, a p-type second semiconductor layer, a light emitting layer provided between the firstsemiconductor layer and the second semiconductor layer, and a third semiconductor layer having a band gap larger than that of the light emitting layer, and the third semiconductor layer includes a first part provided between the light emitting layer and the second semiconductor layer, and a second part that is in contact with a side surface of the light emitting layer.
Description
technical field [0001] The present invention relates to a lighting device and a projector. Background technique [0002] Semiconductor lasers are expected to be next-generation light sources with high luminance. In particular, it is expected that semiconductor lasers having nanostructures such as nanocolumns, nanowires, nanorods, and nanopillars can achieve high The output of the luminescent light emitting device. [0003] For example, Patent Document 1 discloses a light-emitting element including a plurality of nanopillars on a conductive substrate, and an insulating layer buried between adjacent nanopillars. The nanocolumn has a light emitting layer made of a nitride semiconductor or an oxide semiconductor. [0004] Patent Document 1: Japanese Patent Laid-Open No. 2008-244302 [0005] In the light-emitting device disclosed in Patent Document 1, dangling bonds are formed on the side surfaces of the light-emitting layer, which may cause surface recombination. When surfa...
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Application Information
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