KBBF晶体的热膨胀

ＫＢＢＦ晶体的热膨胀洪海平，林绮（中科院福建物构所，福州３５０００２）周淑琴，金祥凤（中科院化学研究所，北京１０００８０）我国在无机非线性光学材料研究中具有国际领先地位，在阴离子基团理论指导下发现的ＫＢｅ＿２ＢＯ＿３Ｆ＿２（ＫＢＢＦ）是一种性能优异的...     

反式聚苯乙炔的光电导

聚苯乙炔(PPA)是一种共轭高分子材料,具有较好的光电导性能。因反式PPA比顺式具有较高的光暗比,本文研究了反式PPA的光导和暗导特性,得到的光、暗导曲线基本平行,说明本征载流子和光生载流子的输运机制是相似的。在欧姆区的光导和暗导的活化能分别为0.24±0.03eV和0.58±0.03eV。     

聚苯乙炔的顺、反异构和光电导的研究

聚苯乙炔(PPA)作为一种较有前途的光电导材料,目前已引起不少化学家和物理学家的广泛关注。研究表明,反式PPA比顺式具有较高的光电导^[1],而且对电子给体或受体的掺杂均具有灵敏的响应^[2],有可能被用作未来的光电器件。我们在研究顺、反式PPA光电性能的基础上^[3-5],进一步研究了顺、反异构化和它们的光电导。     

硼酸盐熔液的红外光谱

本文用快速淬火和傅里叶红外光谱方法研究了三硼酸锂晶体生长的熔液结构以及助熔剂添加晶体生长的影响。     

导电高聚物聚苯乙炔及其衍生物

聚苯乙炔(PPA)是一种具有半导体特性的高聚物。本文介绍了PPA及其衍生物的合成、化学结构与谱图及载流子的输运性质。     

KBBF与B_2O_3的FT－IR研究

本文用ＦＴ－ＩＲ研究了不同组成的ＫＢＢＦ与Ｂ＿２Ｏ＿３的红外谱图，得出了Ｂ＿２Ｏ＿３含量对有关谱线强度比的定量曲线．这对ＫＢＢＦ晶体的制备具有一定的参考价值．     

PHOTOCONDUCTIVITY STUDY OF A POTENTIAL PHOTOREFRACTIVE POLYMER

Photoconductive properties of a polymer designed to be photorefractive are investigated. The polymer is composed of photoconducting PVK [poly(n-vinylcarbazole)], photosensitizing TNF (2, 4, 7-trinitro-9-fluorenone), and optically nonlinear DANS (4-N, N-dimethyl-4′-nitrostilbene). The electric-field dependence and λ dependence of its photoconductivity and photocarrier generation efficiency have been measured. And preliminary four-wave mixing experiments have been carried out.     

无机非线性光学材料的探索

我国在无机非线性光学晶体某些研究中处于国际领先水平。本文就非线性光学材料的发展，应用及前景作了综合的回顾。     

VOLT-AMPERE CHARACTERISTICS OF CIS-POLY(PHENYL ACETYLENE)

The volt-ampere (Ⅰ-Ⅴ) characteristics of the c/s-poly (phenyl acetylene) (PPA) of cis-transoidal structure has been studied in the temperature range of 253-288K. An ITO/ PPA/ Au sandwich configuration was used for the measurements. Under an applied field of less than 10~5V/ cm it showed ohmic behavior, while the space charge limited current (SCLC) was observed at applied fields above 5×10~5V/ cm. In the ohmic region a conductivity of 1.37×10~(-16)S/ cm was obtained at room temperature with an activation energy of 0.5eV. These data indicate that the conduction is not intrinsic one but is the result of thermal release of trapped carriers. In fact the data in the SCLC region treated according to the theory for a single Gaussian distribution of traps gave a mean trap energy of 0.48 eV with a half-width of 0.4 eV and a total density of trapping states of 5×10~(16)/cm~3.     

新型无机非线性晶体SBBO的生长,助熔剂探索和相关系

非线性光学的发展,使得寻找新材料日益重要。我们在成功开发出BBO、LBO的基础上,用阳离子基团理论作指导,寻找具有优异性能的真空紫外倍频材料。本文对新型无机非线性光学晶体Sr_2Be_2B_2O_7(SBBO)的生长、助熔剂及相关系进行了深入的研究。