Ultraviolet light emitting device using metal non-bondable amorphous fluororesin molding compound
View Patent ↗An ultraviolet light emitting device having high quality and high reliability is provided by preventing deterioration of electrical characteristics which is associated with an ultraviolet light emission operation and caused by a sealing resin. The ultraviolet light emitting device is an ultraviolet light emitting device including: an ultraviolet light emitting element ( 2 ) formed of a nitride semiconductor; and an ultraviolet-transparent sealing resin ( 3 ) covering the ultraviolet light emitting element ( 2 ), wherein at least a specific portion ( 3 a ) of the sealing resin ( 3 ), which is in contact with pad electrodes ( 18 ) and ( 17 ) of the ultraviolet light emitting element ( 2 ), is a first type amorphous fluororesin, and a terminal functional group of a polymer or a copolymer that forms the first type amorphous fluororesin is a nonreactive terminal functional group which is not bondable to a metal that forms the pad electrodes ( 16 ) and ( 17 ).
1. An ultraviolet light emitting device comprising: an ultraviolet light emitting element formed of a nitride semiconductor; and an ultraviolet-transparent sealing resin covering the ultraviolet light emitting element, wherein
at least a specific portion of the sealing resin, which is in direct contact with a pad electrode of the ultraviolet light emitting element, is a first type amorphous fluororesin, and
a terminal functional group of a polymer or a copolymer that forms the first type amorphous fluororesin is a nonreactive terminal functional group which is not bondable to a metal that forms the pad electrode.
2. The ultraviolet light emitting device according to claim 1 , comprising a base with metal electrode wiring formed on a part of a surface of a substrate, wherein the ultraviolet light emitting element is placed on the base, and
the pad electrode of the ultraviolet light emitting element is electrically connected to the metal electrode wiring.
3. The ultraviolet light emitting device according to claim 2 , wherein the pad electrode and the metal electrode wiring face each other, and are electrically and physically connected to each other with a bump material interposed therebetween, and
an air gap between a side of the ultraviolet light emitting element provided with the pad electrode and an upper surface of the base is filled with the first type amorphous fluororesin.
4. The ultraviolet light emitting device according to claim 2 , wherein a portion of the sealing resin, which is in contact with the metal electrode wiring, is the first type amorphous fluororesin.
5. The ultraviolet light emitting device according to claim 1 , wherein the terminal functional group is a perfluoroalkyl group.
6. The ultraviolet light emitting device according to claim 5 , wherein the terminal functional group is CF 3 .
7. The ultraviolet light emitting device according to claim 1 , wherein a structural unit that forms the polymer or the copolymer has a fluorine-containing aliphatic cyclic structure.
8. The ultraviolet light emitting device according to claim 1 , wherein the center emission wavelength of the ultraviolet light emitting element is shorter than 290 nm.
9. The ultraviolet light emitting device according to claim 1 , wherein a portion of the sealing resin, other than the specific portion, is the first type amorphous fluororesin, or a second type amorphous fluororesin having a terminal functional group different from that of the first type amorphous fluororesin.