公开(公告)号：US20180371311A1

公开(公告)日：2018-12-27

申请号：US15775318

申请日：2017-10-20

Applicant: Intematix Corporation

Inventor： Haoguo Zhu ,  Yi-Qun Li

IPC: C09K11/02 ,  C09K11/77 ,  F21K9/64 ,  H01L33/50

CPC classification number: C09K11/025 ,  C09K11/7731 ,  C09K11/7786 ,  F21K9/64 ,  H01L33/32 ,  H01L33/486 ,  H01L33/504 ,  H01L33/507 ,  H01L33/56 ,  H01L33/60 ,  H01L33/62

Abstract: A coated phosphor may comprise: phosphor particles comprised of a phosphor with composition (M)(A)2S4: Eu, wherein: M is at least one of Mg, Ca, Sr and Ba; and A is at least one of Ga, Al, In, Y; a dense impermeable (pinhole-free) coating of an oxide material encapsulating individual ones of the phosphor particles. The coated phosphor is configured to satisfy one or more of the conditions: (1) under excitation by blue light, the reduction in photoluminescent intensity at the peak emission wavelength after 1,000 hours of aging at about 85° C. and about 85% relative humidity is no greater than about 30%; (2) the change in chromaticity coordinates CIE(y), ΔCIE y, after 1,000 hours of aging at about 85° C. and about 85% relative humidity is less than about 5×10−3; (3) said coated phosphor does not turn black when suspended in a 1 mol/L silver nitrate solution for at least two hours at 85° C.; (4) said coated phosphor does not turn black when suspended in a 1 mol/L silver nitrate solution for at least one day at 20° C.; and (5) said coated phosphor does not turn black when suspended in a 1 mol/L silver nitrate solution for at least 5 days at 20° C.