Light-emitting device including photoluminescent layer
US10113712B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 3, 2016 |
| Grant date | Oct 30, 2018 |
| Priority date | — |
| Expiry date | Aug 26, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/124
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
a light-emitting device including: a photoluminescent layer that contains a photoluminescent material and emits light including first light having a wavelength λa in air; and a light-transmissive layer located on or near the photoluminescent layer. At least one periodic structure is defined on at least one of the photoluminescent layer and the light-transmissive layer. The at least one periodic structure has projections or recesses or both. A distance Dint between two adjacent projections or two adjacent recesses and a refractive index nwav-a of the photoluminescent layer for the first light satisfy λa/nwav-a<Dint<λa. A wavelength A of a peak intensity in a spectrum of light output from the at least one periodic structure in a direction perpendicular to the photoluminescent layer is different from a wavelength B of a peak intensity in an emission spectrum of the photoluminescent material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.