PDF Publication Title:
Text from PDF Page: 060
24 Handbook on the Physics and Chemistry of Rare Earths x=0 x=0.25 100 80 60 40 20 0 50 100 150 200 Temperature (°C) Temperature-dependent emission intensity of the (Sr1xBax)3SiO5:Eu2+ (x1⁄40 and 0.25). Redrawn from Shao, Q., Lin, H., Dong, Y., Fu, Y., Liang, C., He, J., Jiang, J., 2015. Thermostability and photostability of Sr3SiO5:Eu2+ phosphors for white LED applications. J. Solid State Chem. 225, 72–77. content, the emission intensity of Sr3SiO5:Eu2+ decreases and its quantum yield is down to about 68% under excitation at 450 nm. The effect of thermal stability on temperature quenching is significantly important for practical applications in white LEDs. The emission intensity of the (Sr1xBax)3SiO5:Eu2+ (x1⁄40 and 0.2) phosphors decreases when they are heated from room temperature up to 200°C, but one can note that the ther- mal quenching is effectively minimized by Ba substitution (Fig. 16). The emission intensity of Sr3SiO5:Eu2+ and (Sr0.75Ba0.25)3SiO5:Eu2+ at 150°C remains at 92% and 100%, respectively, relative to that at room temperature (Shao et al., 2015), showing that the phosphors are promising as a yellow- emitting materials for white LEDs. In addition, Ce3+-activated Sr3SiO5 phosphors have been widely investi- gated as phosphors for white LEDs, because of their efficient yellow emission under blue light irradiation (Jang and Jeon, 2007a,b; Jang et al., 2008, 2009a,b). Li+-doped Sr3SiO5:Ce3+ phosphors show a broad emission band covering the spectral region 465–700 nm (Jang and Jeon, 2007a). The LER of blue-LED-pumped white LEDs using this phosphor is 31.7 lm/W, which is higher than that of commercial white LEDs (15–30 lm/W); the CCT and the CRI (Ra) are 6857 K and 81, respectively (Jang and Jeon, 2007b). 4.1.1.4 Li2SrSiO4:Eu2+ Phosphors Besides alkaline-earth orthosilicate phosphors AE2SiO4 (AE 1⁄4 alkaline earth), other orthosilicate materials have been widely investigated as host materials for phosphor for withe LEDs because of their excellent chemical and thermal FIG. 16 Relative intensity (%)PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
PDF Search Title:
HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHSOriginal File Name Searched:
Chemistry-Rare-Earths-49.pdfDIY PDF Search: Google It | Yahoo | Bing
Sulfur Deposition on Carbon Nanofibers using Supercritical CO2 Sulfur Deposition on Carbon Nanofibers using Supercritical CO2. Gamma sulfur also known as mother of pearl sulfur and nacreous sulfur... More Info
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)