Hwang Kyu-Seog, Jeon Young-Sun, Lee Young-Hwan, Hwangbo Seung, Kim Jin-Tae
J Nanosci Nanotechnol. 2015 Oct;15(10):7848-52. doi: 10.1166/jnn.2015.11187.
Intense red photoluminescence under ultraviolet excitation was observed in epitaxially-grown europium-doped perovskite BaTiO3 thin films deposited on the SrTiO3 (100), MgO (100) and sapphire (0001) substrates using metal carboxylate complexes. Precursor films prepared by spin coating were pyrolyzed at 250 °C for 120 min in argon, followed by final annealing at 850 °C for 60 min in argon. Crystallinity and epitaxy of the films were analyzed by X-ray diffraction θ-2θ scan and pole-figure analysis. Photoluminescence of the thin films at room temperature under 254 nm was confirmed by a fluorescent spectrophotometer. The obtained epitaxial BaTiO3 thin films on the SrTiO3 (100) and MgO (100) substrates show an intense red-emission lines at 615 nm corresponding to the (5)D0 --> (7)F2 transitions on Eu(3+) with broad bands at 595 and 650 nm.
利用金属羧酸盐配合物，在沉积于SrTiO3(100)、MgO(100)和蓝宝石(0001)衬底上的外延生长的铕掺杂钙钛矿BaTiO3薄膜中观察到了紫外激发下强烈的红色光致发光现象。通过旋涂制备的前驱体薄膜在氩气中于250℃热解120分钟，随后在氩气中于850℃最终退火60分钟。通过X射线衍射θ-2θ扫描和极图分析对薄膜的结晶度和外延进行了分析。用荧光分光光度计确认了薄膜在室温下254nm光激发下的光致发光。在SrTiO3(100)和MgO(100)衬底上获得的外延BaTiO3薄膜在615nm处显示出强烈的红色发射线，对应于Eu(3+)上的(5)D0→(7)F2跃迁，在595和650nm处有宽带。
