The main component of the phosphor

In order to understand the chemical composition of the phosphor , we first think of the firefly 's light, firefly light-emitting principle mainly in the following series of processes . Protein + into light into light into light oxygenated enzyme protein ( glows green ) protein + H2O oxygen into light into light firefly protein that is why can continue to light , and bright twinkling reason , it is worth noting that green light emitted by the firefly is a " cold light ", the results of conversion as plastic additive high as 97% . Secondly , we note that the light emitting plastics , light plastics mainly in common plastic braced little radioactive substances, such as 14C, 35Sr, 90Sr , and Na, Th and a luminescent material ZnS, CaS these sulfides of the irradiation light radiation , is excited and emitted visible light ( luminescence ) . Consisting of: Pink color density formula category Y2O3: Eu white 5.1 ± 0.2 green powder CeMgL11O19: Tb white 4.2 ± 0.2 Blue Pink BaMgAl10O17: Eu white 3.7 ± 0.2 bimodal powder blue BaMgA10O17: (Eu, Mn) 3.8 ± 0.2 on white conversion phosphor, the phosphor is excited infrared composition: chemical composition : YErYbF3 appearance: white inorganic powder, grain size : 30nm excitation wavelength : 980nm color: green features : high transmittance , a higher  iron oxide black solvent resistance, luminescence properties of acid substance is broadly divided into two categories: one is the material heat, heat radiation and light, the other is an object absorbs energy and is excited to an excited state ( non steady state ) back to the ground state in the anti- process releases energy in the form of light . Matrix and rare earth compounds as activators in rare earth luminescent materials and more in the latter category , that rare earth phosphor . Rare earth atom has a wealth of electronic energy levels , because rare earth atom electron configuration 4f orbitals exist , for a variety of energy level transitions to create the conditions to obtain a variety of light-emitting properties. Rare luminescent material is a huge treasure in human development of the various light-emitting materials , the rare earth elements plays a very important role. Cathode-ray emitting material - display phosphors mainly used in televisions, oscilloscopes, radar and other types of computer screen and monitor. Rare red phosphor (Y2O3: Eu and Y2O2S: Eu) for color TV screen , the brightness of the TV to achieve a higher level . Blue and green phosphors are still using non- rare earth phosphors, but La2O2S: Tb ​​green phosphor luminescence characteristics of a good , there is development prospects. Recently color TV unified use EBU ( European Broadcasting Union ) color , Pink is Y2O2S: Eu. The computer does not like the color television that the  plastic processing aid reproducibility of importance , and priority to brightness , and thus stronger in orange red , Y2O2S Eu in an amount of usually 5 ~ 7wt%. Pink color television in the Eu content of about 1.5 times the computer . When the light is a substance into another substance shine again when the back is chemical energy into