Epitaxial Growth of Non-Equilibrium Crystals and their Exciton Spectra

非平衡晶体的外延生长及其激子光谱

• 批准号: 09640391
• 负责人: ITOH Minoru
• 金额: $ 1.79万
• 依托单位: Shinshu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640391/
• 关键词: Epitaxial Growth; Optical Spectra; Non-Equilibrium Crystal; Insulating Crystal; Exciton; Optoelectronics

1. A new vacuum chamber was constructed for epitaxial growth of non-equilibrium ionic crystals.2. By using a RbBr (100) crystal surface cleaved in vacuum as a substrate, NaCl-structured CsI thin films were successfully grown on it.3. CsCI-structured CsI thin films were also prepared on a RbI single crystal cleaved in vacuum.4. The thickness of both films was about 5 nm.5. Both films were found to show sharp exciton bands of NaCl- and CsCl-types in the absorption spectra, respectively.6. Luminescence properties, especially decay profile, of some samples were investigated under the excitation with a Nd : YAG laser purchased by the present Grant-in-Aid.7. The PbF_2 crystal has two different structural modifications even at normal condition ; cubic and orthorhombic. Several kinds of optical spectra of both phases were studied. A part of the obtained results have been already published or accepted for publication.

1.建立了一种用于非平衡离子晶体外延生长的真空室.采用真空解理的RbBr（100）晶体表面作为衬底，成功地在其上生长了NaCl结构的CsI薄膜.在真空劈裂的RbI单晶上制备了CsCl结构的CsI薄膜.两种膜的厚度均为约5nm。两种薄膜在吸收光谱中分别显示出NaCl型和CsCl型的尖锐激子带.在本资助项目购买的Nd：YAG激光器的激发下，研究了一些样品的发光特性，特别是衰减曲线。PbF_2晶体即使在正常条件下也有两种不同的结构变体：立方晶系和正交晶系。研究了两种相的几种光谱。所获得的部分结果已经发表或接受发表。

项目成果

M.Itoh et al.: "Ultraviolet Photoemission Studies of Valence Bands in Lead halides" J.Phys.Soc. Jpn.67/6. 2140-2141 (1998)

M.Itoh 等人：“卤化铅价带的紫外光电发射研究”J.Phys.Soc。

M.Fujita et al.: "Exciton Transition of Orthorhombic and Cubic PbF_2" J.Phys. Soc.Jpn.67/9. 3320-3321 (1998)

M.Fujita 等人：“正交晶系和立方晶系 PbF_2 的激子跃迁”J.Phys。

S.Hashimoto et al.: "Alloying Effect on the n=1 and n=2 Excitons in Mixed K_<1-x>Rb_xI Crystals" J.Phys.Soc.Jpn.67/2. 670-674 (1998)

S.Hashimoto等人：“混合K_<1-x>Rb_xI晶体中n=1和n=2激子的合金化效应”J.Phys.Soc.Jpn.67/2。

M.Fujita et al.: "Exciton Transition of Orthorhomic and Cubic PbF_2" J.Phys.Soc.Jpn.67-9. 3320-3321 (1998)

M.Fujita 等人：“正交和立方 PbF_2 的激子跃迁”J.Phys.Soc.Jpn.67-9。

M.Itoh et al.: "Temperature Dependence of Auger-Free Luminescence in Alkali and Alkaline-Earth.Halides" J.Phys.Soc.Jpn.66/8. 2502-2512 (1997)

M.Itoh 等人：“碱和碱土卤化物中无俄歇发光的温度依赖性”J.Phys.Soc.Jpn.66/8。