TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The rare earth element is selected from yttrium, neodymium, indium, lanthanum, cerium, samarium, europium, gadolinium or dysprosium. The oxide of the rare earth element is in the form of a powder having an average particle size of 0.5-60 mu m. Preferred Composition: The resin composition further comprises, as an inorganic filler other than the oxide of the rare earth element, an oxide of an element selected from silicon, magnesium, titanium, zinc or aluminum.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The reflector is in the form of a flat plate configured such that the reflector can fill up between a die pad on which a light-emitting semiconductor device is mounted, and leads via which electrodes of the light-emitting semiconductor device and external electrodes are connected together, respectively; is in the form of a recessed body configured as a ring-shaped wall member such that the reflector can be arranged on leads via which electrodes of a light-emitting semiconductor device and external electrodes are connected together, respectively, or a die pad on which the leads and the electrodes of the light-emitting semiconductor are mounted, and can accommodate the light-emitting semiconductor device in it. The reflector is configured to fill up between the leads or between the leads and the die pad in continuation with the ring-shaped wall member. The light-emitting semiconductor device has emission wavelength of not greater than 500 nm.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The organic resin is a polyphthalamide, epoxy or silicone resin and 5-100 wt.% of the organic resin comprises silicone resin. EXAMPLE - Methyltrichlorosilane (100 pbw) and toluene (200 pbw) were placed in a 1 L flask. Under ice cooling, a mixed solution of water (8 pbw) and methyl alcohol (60 pbw) was added dropwise. The dropwise addition was conducted at an internal temperature of -5 to 0 degrees C over 5-20 hours. Subsequently, the resulting mixture was heated, and was then stirred at a reflux temperature for 20 minutes. The reaction mixture was then allowed to cool to room temperature, and water (12 pbw) was added dropwise at less than or equal to 30 degrees C in 30 minutes, followed by stirring for 20 minutes. After water (25 pbw) was further added dropwise, stirring was conducted at 40-45 degrees C for 60 minutes. Subsequently, water (200 pbw) was added, and the resulting organic layer was separated. The organic layer was washed until it became neutral. After that, the resulting organic solution was subjected to azeotropic dehydration, filtration and vacuum stripping, white thermosetting silicone resin (A-1) of formula (CH3)1.0Si(OCH3)0.06(OH)0.11O1.42 (I) as a colorless clear solid (melting point of 76 degrees C, yield of 36 pbw) was obtained. A composition comprised (pbw): TEPIC-S (RTM: tris(2,3-epoxypropyl)isocyanurate) (28), RIKACID MH (RTM: methylhexahydrophthalic anhydride) as acid anhydride (34); the silicone resin (A-1) (37); titanium dioxide (80); Yttrium oxide (A) (average particle size of 10 mu m) (160); fused spherical silica (135); KBM-803 (RTM: 3-mercaptopropyl trimethoxysilane) as silence coupling agent (1); PX-4MP (RTM: methyl-tributyl-phosphonium-dimethylphosphate) as phosphorus-based curing catalyst (1); and calcium stearate (1). The composition showed spiral flow of 28 inches; gel time of 16 seconds; melt viscosity of 7 Pa.s; initial photoreflectance of 95, 92 and 82 % at 450, 400 and 350 nm respectively; photoreflectance after exposed to ultraviolet ray of 91, 86 and 75 at 450, 400 and 360 nm respectively when tested.