论文成果
Graphene-Wrapped Nanoporous Nickel-Cobalt Oxide Flakes for Electrochemical Supercapacitors
- 发布时间：2023-10-19
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- 关键字：Phosphors;Europium - Fluorescence - High temperature applications - Light emission - Light emitting diodes - Phosphates - Photoluminescence - Rare earths - Solid state reactions - Strontium compounds - Thermodynamic stability;Blue light emitting diodes - Blue-emitting phosphor - Concentration quenching - Excitation spectrum - Fluorescence lifetimes - Fluorescence properties - High temperature solid-state reaction - Photoluminescence properties
- 摘要：A series of blue-emitting phosphors Sr<inf>5</inf>(PO<inf>4</inf>)<inf>3</inf>F: Eu<sup>2+</sup>were synthesized by traditional high temperature solid-state reaction method. The micro-morphology and photoluminescence properties of the phosphors were investigated. The Sr<inf>5</inf>(PO<inf>4</inf>)<inf>3</inf>F: Eu<sup>2+</sup>phosphors exhibit broad excitation spectra ranging from 250 to 420 nm, and an intense asymmetric blue emission band peaking at 435 nm. Two different Eu<sup>2+</sup>emission centers in Sr<inf>5</inf>(PO<inf>4</inf>)<inf>3</inf>F: Eu<sup>2+</sup>phosphors were confirmed via their fluorescence properties. The concentration quenching mechanism, fluorescence lifetime and thermal stability of Sr<inf>5</inf>(PO<inf>4</inf>)<inf>3</inf>F: Eu<sup>2+</sup>phosphors were studied in detail. The thermal stability can be improved obviously by anion substitution. The CIE chromaticity coordinates of Sr<inf>5</inf>(PO<inf>4</inf>)<inf>3</inf>F: Eu<sup>2+</sup>phosphors with different Eu<sup>2+</sup>-doped concentrations were calculated. A blue light-emitting diode was fabricated by combination of a 370 nm InGaN chip and the prepared phosphor Sr<inf>5</inf>(PO<inf>4</inf>)<inf>3</inf>F: Eu<sup>2+</sup>. The present work suggests that Sr<inf>5</inf>(PO<inf>4</inf>)<inf>3</inf>F: Eu<sup>2+</sup>is a potential phosphor applied in InGaN-based LEDs. © 2017 Elsevier B.V.
- 卷号：221
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- 是否译文：否