Crystal Structure, Electronic Structure, and Photoluminescence Properties of La3BW1鈥?i>xMoxO9:Eu3+ Red Phosphor

详细信息    查看全文

• 作者：Jinping Huang ; Binghu Hou ; Hongya Ling ; Jie Liu ; Xibin Yu
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：September 15, 2014
• 年：2014
• 卷：53
• 期：18
• 页码：9541-9547
• 全文大小：514K
• ISSN：1520-510X

文摘

A series of La₃BW_1鈥?i>xMo_xO₉:Eu³⁺ (x = 0鈥?.4) polycrystalline powders were prepared by using solid-state reactions. The phase structure, UV鈥搗is absorption spectra, and photoluminescence properties were studied as a function of the Mo/W ratio. When Mo⁶⁺ ions are incorporated into the lattice, the characteristic sharp lines in the excitation spectra of Eu³⁺ monitored at 617 nm are prominently enhanced, which join the ligand-to-metal charge transfer (LMCT) band of La₃BW_1鈥?i>xMo_xO₉:Eu³⁺ into a broad band ranging from 250 to 450 nm centered at 375 nm. The intensity of the broad excitation band reaches a maximum when the content of Mo⁶⁺ ions increases to x = 0.3. On the other hand, the LMCT band around 306 nm decreases and shifts toward the longer wavelength. These features are advantageous to near-UV or blue light GaN-based LED applications. Orbital population analysis by density functional theory calculation (DFT) reveals that the near-UV excitation of La₃BW_1鈥?i>xMo_xO₉:Eu³⁺ red phosphor is due to the electronic transition from the O 2p orbital to the W 5d and Mo 4d orbitals, respectively. With the introduction of Mo⁶⁺ into the lattice, the band gap of La₃BW_1鈥?i>xMo_xO₉ becomes narrower than that of the pure phase La₃BWO₉.