US 11,942,569 B2
Methods and packages for enhancing reliability of ultraviolet light-emitting devices
Masato Toita, Tokyo (JP); Satoshi Yamada, Tokyo (JP); Ken Kitamura, Tokyo (JP); Craig Moe, Latham, NY (US); and Amy Miller, Ballston Lake, NY (US)
Assigned to CRYSTAL IS, INC., Green Island, NY (US)
Filed by Masato Toita, Tokyo (JP); Satoshi Yamada, Tokyo (JP); Ken Kitamura, Tokyo (JP); Craig Moe, Latham, NY (US); and Amy Miller, Ballston Lake, NY (US)
Filed on Jan. 31, 2018, as Appl. No. 15/884,461.
Claims priority of provisional application 62/568,350, filed on Oct. 5, 2017.
Claims priority of provisional application 62/452,594, filed on Jan. 31, 2017.
Prior Publication US 2018/0219124 A1, Aug. 2, 2018
Int. Cl. H01L 33/06 (2010.01); H01L 31/0203 (2014.01); H01L 33/32 (2010.01); H01L 33/40 (2010.01); H01L 33/48 (2010.01); H01L 33/58 (2010.01); H01L 33/64 (2010.01); H01L 25/16 (2023.01); H01L 33/56 (2010.01)
CPC H01L 33/06 (2013.01) [H01L 31/0203 (2013.01); H01L 33/32 (2013.01); H01L 33/405 (2013.01); H01L 33/486 (2013.01); H01L 33/58 (2013.01); H01L 33/648 (2013.01); H01L 25/167 (2013.01); H01L 33/56 (2013.01)] 32 Claims
OG exemplary drawing
 
18. An illumination device comprising:
a package comprising (i) a base defining a recessed interior volume and (ii) a transparent lid disposed over the base and covering the interior volume, wherein the base comprises a horizontal first surface disposed below the lid;
a light-emitting device configured to emit ultraviolet (UV) light and disposed within the interior volume;
a first epoxy sealing the lid to the base;
a metallization pattern disposed on the first surface of the base and electrically coupled to the light-emitting device;
one or more voltage-regulation devices (i) disposed within the interior volume and over the first surface of the base and (ii) electrically coupled to the metallization pattern;
a second epoxy attaching at least one said voltage-regulation device to the base, the second epoxy being disposed between and bonding the first surface of the base to a surface of the voltage-regulation device that faces the first surface of the base; and
an opaque encapsulant that encases, to prevent propagation of UV light thereto, (i) an entirety of the at least one said voltage-regulation device, and (ii) an entirety of the second epoxy, the opaque encapsulant also coating a portion of the metallization pattern,
wherein the interior volume is substantially free of oxygen.