National Laboratory of Solid State Microstructures, Ecomaterials and Renewable Energy Research Center (ERERC), and Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China.
Dalton Trans. 2013 Oct 7;42(37):13502-8. doi: 10.1039/c3dt51029h. Epub 2013 Jul 30.
Luminescent properties of Eu(3+) activated double perovskite structure Ca3WO6 were investigated. It emits an ideal red color centered at the wavelength of 618 nm with suitable excitation from f-f transitions of Eu(3+) ions (360-550 nm) matching the near ultraviolet and blue LEDs. Charge compensation effect of Li(+), Na(+), and K(+) was investigated, and K(+) proved to be the best. The co-doping ion K(+) has a great effect on the lattice distortion of the host matrix Ca3WO6, which facilitates the red emission of Eu(3+). The substitution site for Ca in Ca3WO6 was analyzed in detail by Raman spectra and calculation results. A-site substitution is responsible for the red emission of Eu(3+) activated Ca3WO6. The integrated emission intensity of optimal Ca3WO6:K(+),Eu(3+) excited at 395 nm is about 3.5 times greater than that of Y2O2S:Eu(3+) commercial phosphors, which makes it a promising red phosphor for white LEDs.
研究了 Eu(3+)激活的双钙钛矿结构 Ca3WO6 的发光性能。它在波长为 618nm 的理想红色范围内发射，适用于 Eu(3+)离子的 f-f 跃迁（360-550nm）激发，与近紫外和蓝色 LED 相匹配。研究了 Li(+)、Na(+)和 K(+)的电荷补偿效应，结果表明 K(+)是最佳的。共掺杂离子 K(+)对 Ca3WO6 基质的晶格畸变有很大影响，有利于 Eu(3+)的红光发射。通过拉曼光谱和计算结果详细分析了 Ca3WO6 中 Ca 的取代位置。A 位取代是 Eu(3+)激活 Ca3WO6 产生红光发射的原因。在 395nm 激发下，最佳 Ca3WO6:K(+),Eu(3+)的积分发射强度约为商用 Y2O2S:Eu(3+)荧光粉的 3.5 倍，这使其成为一种有前途的白光 LED 红色荧光粉。
