ABSTRACT

To the best of our knowledge, we present the first study on temperature-dependent photoluminescence (PL) of Al-doped and Ag co-doped ZnO nanoparticles (NPs) obtained by sol-gel co-precipitation. FTIR spectra revealed the presence of Zn-O, Al-O and Ag-O bonds in the respective samples. FESEM images showed spherical NPs in undoped ZnO, which were transformed into granular and rod-like structure by Al doping and subsequently Ag co-doping developed flower-like structure having pin pointed nanorods embedded in petals. Red-shift of the band-gap of ZnO was noticed which is attributed to the contribution of charge carriers by Al and Ag. The PL emission peaks got red-shifted on incorporating with Al and Ag because of the creation of extended energy level network. Reduction from room temperature to −10°C also led to a red-shift of PL emission peaks. This combined impact of doping, co-doping and temperature opens-up a new avenue of designing materials for luminescence thermometry.

摘要

据我们所知，我们首次研究了通过溶胶-凝胶共沉淀获得的 Al 掺杂和 Ag 共掺杂 ZnO 纳米粒子 (NPs) 的温度依赖性光致发光 (PL)。FTIR 光谱揭示了各自样品中存在 Zn-O、Al-O 和 Ag-O 键。FESEM 图像显示未掺杂 ZnO 中的球形 NP，通过 Al 掺杂将其转变为颗粒状和棒状结构，随后 Ag 共掺杂形成花状结构，其花瓣中嵌入了针尖纳米棒。注意到 ZnO 带隙的红移归因于 Al 和 Ag 的电荷载流子的贡献。由于扩展的能级网络的产生，PL发射峰在与Al和Ag结合时发生了红移。从室温降低到 -10°C 也会导致 PL 发射峰的红移。