摘要:
As one of purposes, the present invention provides: a single-crystal phosphor which can exhibit excellent properties under high-temperature conditions; and a light-emitting device in which the phosphor is used. As one embodiment, a single-crystal phosphor is provided, which has a chemical composition represented by the compositional formula: (Y 1-x-y-z Lu x Gd y Ce z ) 3+a Al 5-a O 12 ( 0 ≤ x ≤ 0.9994 , 0 ≤ y ≤ 0.0669 , 0.0002 ≤ z ≤ 0.0067 , -0.016 ≤ a ≤ 0.315 ).
摘要翻译:作为目的之一,本发明提供:在高温条件下可以表现出优异性能的单晶荧光体; 以及使用荧光体的发光装置。 作为一个实施方案,提供了具有由组成式表示的化学组成的单晶荧光体:(Y 1-xy z Lu x Gd y Ce z)3 + a Al 5-a O 12(0‰¤x‰ ¤0.9994,0‰¤‰0.0669,0.0002‰¤‰0.0067,-0.016‰¤‰¤0.315)。
摘要:
A UV photoexcited red light-emitting material comprising a fluoride single crystal represented by the chemical formula: M 1-x RE x F 2+x-w , wherein M is at least one metal element belonging to Group 2 of the Periodic Table selected from the group consisting of Be, Mg, Ca, Sr, and Ba, RE is a rare earth element, and the relationships: 0
摘要:
Provided is a wavelength conversion member 1 which comprises a substrate 10 and a wavelength conversion layer 11 that includes a phosphor particle group 12 and a sealing member 13 for sealing the phosphor particle group 12 and that is provided on the substrate 10 directly or with another layer therebetween, wherein: a predetermined region, in which the area ratio of the cross-section of the phosphor particle group 12 is 50% or more, is included in an arbitrary cross-section parallel to the thickness direction of the wavelength conversion layer 11; when the thickness of the wavelength conversion layer 11 is at least 50 µm, the predetermined region is a rectangular region that has a thickness of 50 µm from the bottom surface of the wavelength conversion layer 11 and a width of 700 µm; and when the thickness of the wavelength conversion layer 11 is less than 50 µm, the predetermined region is a rectangular region that has the same thickness as that of the wavelength conversion layer 11 and a width of 700 µm.
摘要:
[Problem] To provide a light-emitting device which does not undergo the deterioration in luminous efficiency associated with the long-term use. [Solution] A light-emitting device (1) comprises a light-emitting element (10) which can emit blue light and a phosphor (2) which is composed of a single kind of single crystal and can emit yellow light upon the irradiation with the light emitted from the light-emitting element (10) which serves as excitation light. Thus, it becomes possible to prevent the deterioration in luminous efficiency associated with the deterioration in a binder or the like compared with a light-emitting device which utilizes multiple kinds of granular phosphors, because any binder for binding phosphors to each other is not required in the light-emitting device (1).
摘要:
The present invention relates to the field of magnetic functional materials. The present invention discloses a use of a rare earth fluoride single crystal in magnetic refrigeration, a magnetic refrigeration method and a magnetic refrigeration device. A magnetocaloric material of the series is lithium rare earth fluoride, with the chemical formula of LiREF 4 , wherein RE is one or more of rare earth elements gadolinium, terbium, dysprosium, holmium, erbium, thulium and ytterbium. A magnetocaloric material single crystal of the series has extremely strong magnetic anisotropy. By applying a varying magnetic field of 0-20kOe along the easy magnetization axis direction of the magnetocaloric material, LiGdF 4 , LiTbF 4 , LiHoF 4 , LiDyF 4 , LiErF 4 , LiYbF 4 and LiTmF 4 obtained isothermal magnetic entropy changes of 50.35J·kg -1 ·K -1 , 21.12J·kg -1 ·K -1 , 24.98J·kg -1 ·K -1 , 24.45J·kg -1 ·K -1 , 21.95J·kg- 1 ·K -1 , 14.7J·kg -1 ·K -1 and 0.692J·kg -1 ·K -1 , respectively, at 1.8K, 4K, 4K, 1.8K, 1.8K, 1.8K, and 18K. Wherein, the thermal conductivity of LiTbF 4 and LiErF 4 reaches 50W·K -1 ·m -1 at 25K.