Abstract: Provided is a microsphere including a glass sphere core. The glass sphere core includes a first nuclide, a second nuclide and a diffusion region extending inwardly from an outer surface of the glass sphere core, with the second nuclide distributed in the diffusion region. The first nuclide and the second nuclide become radioactive after being activated by neutrons to produce radiations including ?-rays or ?-rays, or simultaneously ?-rays and ?-rays. A preparation method of a microsphere is also provided.

Abstract: Provided is a radioactive microsphere including glass having a structure represented by a formula Ca3Si2O7 and yttrium oxide contained in the glass. The radioactive microsphere has sphericity of from 0.71 to 1, and is radioactive after being activated by neutron irradiation. A method for preparing a radioactive microsphere and a radioactive filler composition is further provided. The present disclosure can be used to treat tumor by delivering radioactive microspheres to the target tissue, and then radioactive microspheres are activated by neutrons to generate radiation. The radioactivity of microspheres disappears over time, and the microspheres were dissolved and absorbed by the bone tissue in the end.

Abstract: Provided is a radioactive microsphere including a glass sphere core. The glass sphere core includes a first seed, a second seed and a diffusion region extending inwardly from an outer surface of the glass sphere core, with the second seed distributed in the diffusion region. The first seed and the second seed become radioactive after being activated by neutrons to produce radiations including ?-rays or ?-rays, or simultaneously ?-rays and ?-rays. A preparation method of a radioactive microsphere is also provided.

Abstract: A light emitting diode (LED) structure includes a substrate with a surface and cylindrical photonic crystals, a first type doping semiconductor layer, a first electrode, a light emitting layer, a second type doping semiconductor layer and a second electrode. The first type doping semiconductor layer is formed on the substrate to cover the photonic crystals. The light emitting layer, the second type doping semiconductor layer and the second electrode are sequentially formed on a portion of the first type doping semiconductor layer. The first electrode is formed on the other portion of the first type doping semiconductor layer without being covered by the light emitting layer. Because the substrate with photonic crystals can improve the epitaxial quality of the first type doping semiconductor layer and increase the energy of the light forwardly emitting out of the LED, the light emitting efficiency of the LED is effectively enhanced.