Synthesis and Composition Control of Red Nitride Phosphors for Applications in Light-emitting Diodes
Date Issued
2016
Date
2016
Author(s)
Tsai, Yi-Ting
Abstract
Traditional WLEDs are fabricated using blue chip and yellow phosphor to produce white light, with high efficiency but poor color rendering index (CRI) because of the lack of a red component. In this work, using chemical substitution and synthesis conditions on the basis red nitride phosphors, while theoretical discussion of their chemical properties. The light emission of Sr2Si5N8:Eu2+ at 620 nm, the orange light is ideal to red source. The properties of Sr2Si5N8:Eu2+ can be tailored by tuning the pressure, temperature, and sintering time in the basic sintering process. In the synthesis of Sr2Si5N8:Eu2+, Sr2Si5N8:Eu2+ was converted into SrSi6N8:Eu2+ during heating. CaAlSiN3: Eu2+ is also one of the highly stable material, which is located 650 nm. (Sr,Ca)AlSiN3:Eu2+, was developed through cation substitution and blue shift to 620 nm of peak position. Distortion of the lattice structure introduced adequate space and highly coordinated sites in the Sr/Eu centers for charge variation effect. Subsequently, typically arranged variations of the SiN¬4 and AlN4 clusters were formed in the lattice by Raman and ssNMR technique. SrLiAl3N4:Eu2+ presents a narrow band red phosphor for reducing near infrared region emission. In this study, SrLiAl3N4:Eu2+ red phosphor was prepared through a high-pressure solid-state reaction and was coated with organosilica layers to improve water resistance. The coated samples exhibited excellent moisture resistance while retaining external quantum efficiency in high temperature and high humidity. This study provides valuable information on the stimulation of nitride phosphors in LEDs
Subjects
red phosphor
solid state
Type
thesis
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