公开(公告)号：US20190284472A1

公开(公告)日：2019-09-19

申请号：US16465979

申请日：2017-02-22

Applicant: LG ELECTRONICS INC.

Inventor： Dongwon KANG ,  Soongil KIM ,  Hongjung KIM ,  Gunyoung HONG

IPC: C09K11/77 ,  F21S41/176

Abstract: Provided are a polycrystalline phosphor film applicable to a high-power optical device, a preparation method therefor, and a vehicle lamp device using the same, wherein the polycrystalline phosphor film comprises a plurality of phosphor crystals and pores formed between the phosphor crystals, and the phosphor crystal can be a synthesized product comprising at least one rare earth material and cerium (Ce). In addition, the method for preparing a polycrystalline phosphor film can comprise the steps of: preparing a phosphor powder comprising a plurality of phosphor particles; injecting the phosphor powder into a predetermined mold so as to mold the same into a predetermined shape; generating a sintered body by primarily sintering, at a first temperature, the phosphor powder having the predetermined shape; secondarily sintering the sintered body, having been primarily sintered, at a second temperature lower than the first temperature; and forming a polycrystalline phosphor film by processing the sintered body having been secondarily sintered.