engineering. Ternary Zn1−xCdxO allows reduction of the band gap relative to ZnO, which would be necessary for devices emitting visible light. We have analyzed the structural and optical properties of Zn1−xCdxO layersgrown by metalorganicvapor-phaseepitaxy. A narrowing of the fundamental band gap of up to 300 meV has been observed, while introducing a lattice mismatch of only 0.5% with respect to binary ZnO
Zn1−xCdxOfilms in the range of the content x from x=0 to x=1 were grown by remote-plasma-enhanced metal organic chemical vapor deposition. The crystal structure of Zn1−xCdxOfilm changed with increase of the content x from wurtzite structure to rocksalt structure around x=0.7. The relationship between the cadmium content and axis length in the Zn1−xCdxOfilms was studied. Photoluminescence spectra
Carrier recombination dynamics in wurtziteZn1−xCdxOalloyfilms has been studied by time-resolved photoluminescence (PL) to evaluate the potentialfluctuation. Typical PL lifetime τ2 in Zn1−xCdxO is around 200 ps and gradually increases with a Cd content of up to 0.19. At a Cd content over 0.3, τ2 becomes roughly 50 ns. The degree of potentialfluctuation E0 is increased from 9 to 157 meV with an
Blue Luminescence of MgZnO and CdZnO Films Deposited at Low Temperatures
作者:Yusuke Ogawa、Shinobu Fujihara
DOI:10.1149/1.2756372
日期:——
Blue photoluminescence was successfully generated from zinc oxide by doping magnesium or cadmium. MgZnO and CdZnOfilms were deposited on glass substrates by a spin-on/pyrolysis with low heating temperatures (600-700°C) in H 2 /N 2 and air, respectively. Structural analysis revealed that all the films were crystallized in the wurtzite-type structure. The c-axis length of ZnO was changed by the doping
Wide visible emission and narrowing band gap in Cd-doped ZnO nanopowders synthesized via sol-gel route
作者:Leta T. Jule、Francis B. Dejene、Abdub G. Ali、Kittessa T. Roro、Aiat Hegazy、Nageh K. Allam、Essam El Shenawy
DOI:10.1016/j.jallcom.2016.06.176
日期:2016.12
concentration. The modulation in optical band gap of the samples decreases from 3.15 eV to 2.76 eV are believed to be responsible for the red shift in Ultra-violet visible (UV–Vis) spectroscopy with increase in Cd content. The photoluminescence (PL) spectra shows strong UV emission at 378.8 nm and wide visible light emission outspreading from 425 nm to 600 nm with monotonous red shift. The method employed would
摘要 采用简便的溶胶-凝胶法合成了Cd掺杂ZnO纳米粉体(Zn 1− X Cd XO , 0.15≤ X ≤0.45)。X 射线衍射 (XRD) 显示粉末具有六方纤锌矿结构的 ZnO 多晶,而没有形成对应于 CdO、Cd 或 Zn 簇的第二相。发现样品的结晶度随着镉含量的增加而恶化,并且优选沿(002)生长。此外,扫描电子显微镜 (SEM) 图像表明存在均匀的微晶尺寸分布,随着镉浓度的增加而减小。样品的光学带隙调制从 3.15 eV 降低到 2.76 eV,据信是造成紫外可见光 (UV-Vis) 光谱随 Cd 含量增加而发生红移的原因。光致发光 (PL) 光谱在 378.8 nm 处显示出强烈的紫外发射和从 425 nm 扩展到 600 nm 的宽可见光发射,具有单调的红移。所采用的方法非常适合合成用于在可见光区域运行的器件以及开发异质结 (Cd:ZnO) 结构的材料。