Spectroscopy of Ordered Materials

[9424216]本实验项目研究发光材料的光学性质，重点研究其光激发态的动力学性质；这些性质是由活性中心之间的相互作用和与固体的基本激发产生的。新的光学活性材料将通过激光加热基座生长方法合成，设计和表征，其中非线性光学过程可以通过样品的成分变化精确控制。此外，还研究了有序材料中窄带非平衡声子和磁振子诱导激发态的动力学过程。这些研究将为固体中的弛豫和输运性质提供更好的见解。正在对发光或发光材料的光谱特性进行研究。所研究的材料被广泛应用于各种通信和显示技术中。该项目涉及的方法可以合成具有更好性能的新材料，并根据其光学特性进行改进。为了改进这些材料，必须对固体主体中负责发光的原子中心与其周围环境之间的相互作用有一个基本的了解；这些过程经常导致光激发态的耗散和松弛，需要抑制以提高材料效率。这里提出的光学研究有望为这些相互作用提供基本的见解。＊＊＊

9424216 Yen This experimental project studies of the optical properties of luminescent materials with emphasis on the dynamical properties of the optically excited states; these properties arise from interactions between the active centers and with the elementary excitations of the solid. New optically active materials will be synthesized, engineered, and characterized through the Laser Heated Pedestal Growth method in which non-linear optical processes can be accurately controlled through compositional changes in the samples. In addition, the dynamical processes of excited states induced by narrow band non- equilibrium phonons and magnons in ordered materials will be investigated. These studies will provide better insights into relaxation and transport properties in solids. %%% Studies of the optical spectroscopic properties of materials which are luminescent or emit light are being carried out. The materials being studied are employed in a wide variety of communications and display technologies. The project involves methods whereby new materials with better properties can be synthesized and improved as a result of their optical characterization. In order to improve these materials a fundamental understanding of the interactions between the atomic centers responsible for emitting light and their surroundings in the solid host must be arrived at; these processes often lead to dissipation and relaxation of the optically excited atomic state and need to be suppressed to improve material efficiencies. The optical studies proposed here are expected to provide basic insights on these interactions. ***