Abstract:
Provided are: a YAG-based single crystal phosphor which produces fluorescence of a non-conventional color; and a phosphor-containing member and a light emitting device, each of which is provided with this single crystal phosphor. Provided as one embodiment of the present invention is a single crystal phosphor which has a composition represented by composition formula (Y 1-a-b Lu a Ce b ) 3+c Al 5-c O 12 (wherein 0 ‰¤ a ‰¤ 0.9994, 0.0002 ‰¤ b ‰¤ 0.0067 and -0.016 ‰¤ c ‰¤ 0.315), and which has an emission spectrum having CIE chromaticity coordinates x and y satisfying the relation -0.4377x + 0.7384 ‰¤ y ‰¤ -0.4585x + 0.7504 when the peak wavelength of the excitation light is 450 nm at the temperature of 25°C.
Abstract:
The present invention provides a single crystal for an optical isolator having a Faraday rotation angle exceeding that of TGG single crystal in a wavelength region of 1064 nm or longer or in a wavelength region of shorter than 1064 nm, and is capable of realizing enlargement of crystal size, a production process thereof, an optical isolator, and an optical processor that uses the optical isolator. The single crystal according to the present invention is composed of a terbium aluminum garnet single crystal, and mainly a portion of the aluminum is replaced with lutetium.
Abstract:
Provided is a light emitting device which is suitable for a lighting apparatus, such as a projector, requiring high brightness and high light intensity exhibits little change in light emission colour and a low reduction in light emission intensity during usage, and uses a remote phosphor. According to one embodiment of the present invention, the light emitting device (10) has: an LED element (12); a side wall (13) which surrounds the LED element (12); a phosphor layer (15) which is fixed to the side wall (13) with an adhesive layer (14) therebetween, and is positioned above the LED element (12); and a metal pad (11) as a heat dissipating member. The side wall (13) has: an insulating base (13b) which surrounds the LED element (12); and a metal layer (13a) which is formed on a side surface at the LED element (12) side of the base (13b), and is in contact with the metal pad (11) and the adhesive layer (14). The adhesive layer (14) is: a resin layer that comprises a resin containing particles which have higher thermal conductivity than the resin; or a layer that comprises solder.
Abstract:
The present invention provides a garnet single crystal comprising a terbium aluminum garnet single crystal, wherein a portion of the aluminum is substituted with scandium, and a portion of at least one of the aluminum and terbium is substituted with at least one type selected from the group consisting of thulium, ytterbium and yttrium.