Time-resolved luminescence spectroscopy by the optical Kerr-gate method applicable to ultrafast relaxation processes
Time-resolved luminescence spectroscopy by the optical Kerr-gate method applicable to ultrafast relaxation processes
复制标题
DOI：
10.1103/physrevb.62.10083
复制
发表时间：
2000-10
影响因子：
3.7
通讯作者：
J. Takeda;K. Nakajima;S. Kurita;S. Tomimoto;S. Saito;T. Suemoto
中科院分区：
文献类型：
--
作者：
J. Takeda;K. Nakajima;S. Kurita;S. Tomimoto;S. Saito;T. Suemoto
利用光学克尔门（Kerr-gate， OKG）方法建立了飞秒时间分辨发光光谱，用于研究材料的超快载流子动力学和弛豫过程。采用具有高非线性折射率的固体玻璃作为克尔介质，获得了亚皮秒的时间分辨率。当石英板作为克尔介质时，光谱系统的克尔效率和仪器响应时间为5 \char 2110{}% and \ensuremath{\sim}250 fs, respectively. By employing the OKG method, we revealed the internal conversion from ${S}_{2}$ to ${S}_{1}$ state of \ensuremath{\beta}-carotene with a low fluorescence quantum yield and an ultrafast fluorescence decay time, and the lifetime of the ${S}_{2}$ state was determined to be 210 fs. An advantage of the OKG method relative to the conventional up-conversion technique is its ability to directly obtain time-resolved luminescence spectra, and thus the OKG method might be superior to the up-conversion technique to investigate ultrafast carrier dynamics and relaxation processes of materials.
We have developed a femtosecond time-resolved luminescence spectroscopy by the optical Kerr-gate (OKG) method to investigate ultrafast carrier dynamics and relaxation processes of materials. Solid glasses with a high nonlinear refractive index were used as the Kerr media to obtain a subpicosecond time resolution. When a quartz plate was used as the Kerr medium, the Kerr efficiency and the instrumental response time of our spectroscopic system were 5\char21{}10 % and \ensuremath{\sim}250 fs, respectively. By employing the OKG method, we revealed the internal conversion from ${S}_{2}$ to ${S}_{1}$ state of \ensuremath{\beta}-carotene with a low fluorescence quantum yield and an ultrafast fluorescence decay time, and the lifetime of the ${S}_{2}$ state was determined to be 210 fs. An advantage of the OKG method relative to the conventional up-conversion technique is its ability to directly obtain time-resolved luminescence spectra, and thus the OKG method might be superior to the up-conversion technique to investigate ultrafast carrier dynamics and relaxation processes of materials.