Optical Characteristics Of Sr2Si3O2N4:Eu2+ Phosphors For White Light Emitting Diodes

Solid-state synthesis, structure, second-harmonic generation, and luminescent properties of noncentrosymmetric BaSi7N10:Eu2+ phosphors

“…Several nitride-and oxynitride-based conversion phosphors have been reported by researchers as suitable conversion phosphors for GaN/InGaN-based LEDs. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] These inorganic materials have attracted much attention due to their excellent chemical and thermal stabilities compared to oxosilicates. In nitride/oxynitride-based hosts, the crystal eld around the activator ions (Eu 2+ /Ce 3+ ) would produce a strong nephelauxetic effect or a large crystal-eld splitting, giving rise to emissions at longer wavelengths of visible spectra.…”

Luminescence characteristics of Sr1−xBaxSi2O2N2:Eu2+ phosphors for white light emitting diodes

“…The commercially available blue light emitting diode (LED; InGaN chip) and single yellow emitting YAG:Ce 3+ based white LEDs have low color rendering index (CRI), high correlated color temperature and lack in red hue which limits it from using for medical and architectural lighting 3, 4. Recently extensive research has been carried out in rare earth doped silicon based nitrides or oxynitrides based phosphors for GaN/InGaN UV or blue LEDs owing to their remarkable characteristics such as thermal and chemical stability, high quantum efficiency (QE), and large band gap 5–12. In order to emit light in the visible region of electromagnetic spectrum, synthesized phosphors have to absorb in near UV to blue spectral range thereby limiting the activators to Eu 2+ and Ce 3+ that can be used in phosphors.…”

Preparation of a Sr2-xEuxSi5N8 Phosphor Using an Ion Transporter

“…24 Consequently, less energy is needed to dissociate the Sr-O bonds than the P-O bonds. Based on the bond dissociation energies, strontium phosphate will decompose into Sr 2+ and PO 4 3− , and, when certain conditions are met, SrO will not be formed. We have confirmed this experimentally.…”

“…Experiments using various strontium sources were conducted to set up experimental control groups and identify new synthesis routes for Sr 2- 4 (99.99%) was fired in an alumina crucible at 1200…”