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利用脉冲激光沉积(PLD)法在Si(111)衬底上制备了ZnO:Eu~(3+),Li+薄膜,分别通过XRD谱和光致发光(PL)谱测试研究了氧分压不同时薄膜结构和发光性质。XRD谱研究表明,所有样品均仅出现ZnO基质的(002)衍射峰,说明Eu~(3+)已进入ZnO基质晶格,没有单独形成结晶氧化物。PL谱研究表明,当用325 nm的光激发样品时,样品的发光仅由ZnO基质的紫外发光和绿光发射组成,没有出现稀土Eu~(3+)的特征发光峰。当用395 nm的光激发样品时,在594和613 nm处出现两个明显的Eu~(3+)特征发光峰,分别属于Eu~(3+)的磁偶极跃迁(~5D_0→~7F_1)和电偶极跃迁(~5D_0→~7F_2),而且随着氧压的增加,594 nm处的发光峰强度变化不大,但613 nm处的发光峰强度明显增强。
ZnO: Eu ~ (3 +) and Li + films were prepared on Si (111) substrates by pulsed laser deposition (PLD) method. The films with different partial pressures of oxygen were investigated by XRD and PL spectra respectively. Structure and luminescent properties. The XRD patterns show that only (002) diffraction peaks of ZnO matrix are observed in all the samples, indicating that Eu 3+ has entered the lattice of ZnO matrix and no crystalline oxide has been formed. PL spectra showed that when the sample was excited with 325 nm light, the luminescence of the sample consisted only of the UV and green emission of the ZnO matrix, and no characteristic luminescence peak of the rare earth Eu 3+ was observed. When the sample is excited with 395 nm, two obvious Eu 3+ luminescence peaks appear at 594 and 613 nm, which belong to the magnetic dipole transitions of Eu 3+ (~ 5D_0 → ~ 7F_1 ) And electric dipole transitions (~ 5D_0 → ~ 7F_2). With the increase of oxygen pressure, the intensity of the emission peak at 594 nm did not change much, but the intensity of the emission peak at 613 nm was significantly enhanced.