School of Materials Science and Nanotechnology, Jadavpur University, Kolkata-700032, India.
Dalton Trans. 2013 Sep 28;42(36):12965-74. doi: 10.1039/c3dt51411k. Epub 2013 Jul 18.
Highly-luminescent nanophosphors have a decisive role in solid-state lighting (SSL) as well as in field emission display (FED) applications due to their potential use in fabrication of nanophosphor based FED and solid state display devices. Herein, the red emitting highly-luminescent Eu(3+)-Li(+) co-doped magnesium aluminate (MgAl2O4) nanophosphors were synthesized by a customized sol-gel route with an average particle size of 18 nm, which can be easily scaled up in a large quantity. The resulting nanophosphor exhibits hypersensitive red emission, peaking at 615 nm upon 394 nm excitation. Furthermore, comparative photoluminescence (PL) studies have been carried out for Eu(3+) doped and Eu(3+) doped-Li(+) co-doped magnesium aluminate (Li(+) co-doped MgAl2O4:Eu(3+)) nanophosphors, which indicated that Li(+) co-doping significantly improves luminescence intensity along with good crystallinity. Moreover, the charge compensation by addition of Li(+) co-activator in MgAl2O4:Eu(3+) lattice led to the two fold enhancement of PL intensity. The obtained results suggest that this nanophosphor could be an ultimate choice for next generation advanced luminescent nanomaterials for solid state lighting and portable FED devices.
高亮度纳米荧光粉由于在基于纳米荧光粉的场发射显示器和固态显示器件的制造中具有潜在的应用，因此在固态照明（SSL）以及场发射显示器（FED）应用中具有决定性作用。在此，通过定制的溶胶-凝胶路线合成了发红光的高亮度 Eu(3+) -Li(+)共掺杂镁铝尖晶石（MgAl2O4）纳米荧光粉，平均粒径为 18nm，可大量轻易地扩大规模。所得纳米荧光粉表现出超灵敏的红光发射，在 394nm 激发下峰值为 615nm。此外，对 Eu(3+)掺杂和 Eu(3+)掺杂-Li(+)共掺杂镁铝尖晶石（Li(+)共掺杂 MgAl2O4:Eu(3+)）纳米荧光粉进行了比较光致发光（PL）研究，表明 Li(+)共掺杂显著提高了发光强度和良好的结晶度。此外，Li(+)共激活剂在 MgAl2O4:Eu(3+)晶格中的电荷补偿导致 PL 强度提高了两倍。所得结果表明，这种纳米荧光粉可能是下一代先进固态照明和便携式 FED 器件用发光纳米材料的最佳选择。
