我們利用光激螢光、時間鑑別光激螢光以及拉曼散射實驗來探討多晶碳六十的光學特性。在光激螢光光譜的分析下,發現多晶碳六十分子的螢光是由準分子振動耦合(excimer vibronic coupling)所產生。在時間鑑別光激螢光光譜實驗中,可以偵測出載子之生命期。由載子生命期隨溫度變化,則可計算出載子從單態到三重態之活化能。考慮載子生命期隨溫度的變化,我們可以精確的解釋多晶碳六十的螢光強度隨溫度的變化。比較多晶碳六十與多晶碳五十九氮,我們發現多晶碳五十九氮較容易被激發,其螢光強度較強。在隨溫度變化之拉曼散射光譜的實驗中,我們發現多晶碳六十在120 K 時有一拉曼光譜具有大幅度的變化,這應該與玻璃相變有關。
We study the optical properties of the polycrystalline C60 by using the photoluminescence, time-resolved photoluminescence and Raman scattering spectra. We suggest a model based on the excimer vibronic coupling to account for the photoluminescence mechanism of polycrystalline C60. The carrier lifetime can be obtained by the time-resolved photoluminescence measurements. We also calculated the activation energy from singlet to triplet state by temperature dependence of carrier lifetime. By considering the variation of carrier lifetime, the temperature-dependent photoluminescence intensity can be well explained. Comparing with C60, the PL intensity of C59N can be enhanced. In temperature dependence of Raman scattering, a Raman peak has a pronounced change in 120 K, probably relating to the glass phase transition in C60.