ZnO is a highly significant II-VI semiconductor known for its excellent optoelectronic properties,making it widely applicable and promising for use in light-emitting devices,solar cells,lasers,and photodetectors.The m...ZnO is a highly significant II-VI semiconductor known for its excellent optoelectronic properties,making it widely applicable and promising for use in light-emitting devices,solar cells,lasers,and photodetectors.The methods for preparing ZnO are diverse,and among them,the hydrothermal method is favored for its simplicity,ease of operation,and low cost,making it an optimal choice for ZnO single-crystal growth.Most studies investigating the effects of different hydrothermal experimental parameters on the morphology and performance of ZnO nano-materials typically focus on only 2—3 variable parameters,with few examining the impact of all possible experimental parameter changes on ZnO nano-mate-rials.The principles of the hydrothermal method and its advantages in nano-material preparation were briefly introduced in this article.The detailed discussion on the influence of various experimental parameters on the preparation of ZnO nano-materials was provided,which including reaction materials,Zn^(2+)/OH^(-)ratio,reaction time and temperature,additives,experimental equipment,and annealing conditions.The review co-vers how different experimental parameters affect the morphology and performance of the materials,as well as how different rare earth doping elements influence the performance of ZnO nano-materials.It is hoped that this work will contribute to future research on the hydrothermal synthesis of nano-materials.展开更多
KMgF_3:Mn^(2+)晶体中Mn^(2+)离子处于近似的六配位八面体对称晶场中,基态零场分裂参量a(即自旋哈密顿参量)已被测出,d—d跃迁吸收谱已被Sibley等人测出。Betty等人用自旋相关模型(SCCF)对其光谱进行了理论计算,其结果不令人满意。一般...KMgF_3:Mn^(2+)晶体中Mn^(2+)离子处于近似的六配位八面体对称晶场中,基态零场分裂参量a(即自旋哈密顿参量)已被测出,d—d跃迁吸收谱已被Sibley等人测出。Betty等人用自旋相关模型(SCCF)对其光谱进行了理论计算,其结果不令人满意。一般而言,统一地计算掺杂晶体的吸收谱和零场分裂参量是一个困难的问题,尤其对d^5系问题就更加困难;Low et al甚至断言用简单的晶体场模型不可能统一地分析Mn^(2+)离子的立方零场分裂和光谱。因此,到目前为止,尚未见到KMgF_3晶体中Mn^(2+)离子的光谱和立方零场分裂值的统一理论解释。本文利用O_h点群表象强场方案,构造了d~系O_h点群的严格的完全能量矩阵,用以统一分析KMgF_3晶体中Mn^(2+)的光谱和立方零场分裂。展开更多
文摘ZnO is a highly significant II-VI semiconductor known for its excellent optoelectronic properties,making it widely applicable and promising for use in light-emitting devices,solar cells,lasers,and photodetectors.The methods for preparing ZnO are diverse,and among them,the hydrothermal method is favored for its simplicity,ease of operation,and low cost,making it an optimal choice for ZnO single-crystal growth.Most studies investigating the effects of different hydrothermal experimental parameters on the morphology and performance of ZnO nano-materials typically focus on only 2—3 variable parameters,with few examining the impact of all possible experimental parameter changes on ZnO nano-mate-rials.The principles of the hydrothermal method and its advantages in nano-material preparation were briefly introduced in this article.The detailed discussion on the influence of various experimental parameters on the preparation of ZnO nano-materials was provided,which including reaction materials,Zn^(2+)/OH^(-)ratio,reaction time and temperature,additives,experimental equipment,and annealing conditions.The review co-vers how different experimental parameters affect the morphology and performance of the materials,as well as how different rare earth doping elements influence the performance of ZnO nano-materials.It is hoped that this work will contribute to future research on the hydrothermal synthesis of nano-materials.
文摘KMgF_3:Mn^(2+)晶体中Mn^(2+)离子处于近似的六配位八面体对称晶场中,基态零场分裂参量a(即自旋哈密顿参量)已被测出,d—d跃迁吸收谱已被Sibley等人测出。Betty等人用自旋相关模型(SCCF)对其光谱进行了理论计算,其结果不令人满意。一般而言,统一地计算掺杂晶体的吸收谱和零场分裂参量是一个困难的问题,尤其对d^5系问题就更加困难;Low et al甚至断言用简单的晶体场模型不可能统一地分析Mn^(2+)离子的立方零场分裂和光谱。因此,到目前为止,尚未见到KMgF_3晶体中Mn^(2+)离子的光谱和立方零场分裂值的统一理论解释。本文利用O_h点群表象强场方案,构造了d~系O_h点群的严格的完全能量矩阵,用以统一分析KMgF_3晶体中Mn^(2+)的光谱和立方零场分裂。
