Polarized optical absorption and photoluminescence measurements in single-crystal thin films of 4′-dimethylamino-N-methyl-4-stilbazolium tosylate
Polarized optical absorption and photoluminescence measurements in single-crystal thin films of 4′-dimethylamino-N-methyl-4-stilbazolium tosylate
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DOI：
10.1063/1.125328
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发表时间：
1999-11-22
影响因子：
4
通讯作者：
Thakur, M
中科院分区：
文献类型：
--
作者：
Bhowmik, AK;Xu, JJ;Thakur, M
有机盐 4'-二甲氨基-N-甲基-4-芪唑鎓甲苯磺酸盐的无水（红色）和水合（橙色）相的单晶薄膜通过剪切方法的改进而生长。在共振和非共振波长下，用沿偶极子/分子轴和垂直于偶极子/分子轴的偏振光测量薄膜的光学吸收系数，并在共振波长处观察到强二色性。考虑到这些薄膜（红相）在高速单通道薄膜电光调制器中的潜在应用，吸收测量非常重要[M. Thakur, J. Xu, A. Bhowmik, and L. Zhou, Appl.物理。莱特。 74, 635 (1999)] and other photonic devices.在这些薄膜中观察到高度偏振光致发光（PL）。测得红相和橙相单晶薄膜的 PL 效率分别约为 12% 和 14%，明显高于溶液中测得的最大 PL 效率 (3%)。 (C) 1999 American Institute of Physics. [S0003-6951(99)01447-3]。
Single-crystal thin films of the anhydrous (red) and the hydrated (orange) phases of the organic salt 4'-dimethylamino-N-methyl-4-stilbazolium tosylate were grown by a modification of the shear method. The optical absorption coefficients of the films were measured with light polarized along and normal to the dipole/molecular axis at both resonant and off-resonant wavelengths, and a strong dichroism was observed at the resonant wavelengths. The absorption measurements are important considering potential applications of these films (red phase) in high-speed single-pass thin-film electro-optic modulators [M. Thakur, J. Xu, A. Bhowmik, and L. Zhou, Appl. Phys. Lett. 74, 635 (1999)] and other photonic devices. Highly polarized photoluminescence (PL) has been observed in these films. The PL efficiencies of the red- and orange-phase single-crystal films were measured to be about 12% and 14%, respectively, which are significantly higher than the maximum PL efficiency measured in solution (3%). (C) 1999 American Institute of Physics. [S0003-6951(99)01447-3].