Diffusion-related lifetime and quantum efficiency of excitons in diamond
Diffusion-related lifetime and quantum efficiency of excitons in diamond
复制标题
金刚石中激子的扩散相关寿命和量子效率
DOI:
10.1103/physrevb.102.195204
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发表时间:
2020
影响因子:
3.7
通讯作者:
Naka N.
中科院分区:
文献类型:
--
作者:
Konishi K.;Akimoto I.;Isberg J.;Naka N.
We investigate the lifetime and luminescence quantum efficiency of excitons in extremely high-purity diamond grown by the chemical vapor deposition method. A clear correlation is found between the diffusion coefficient, lifetime, and quantum efficiency. The effect of small strain (magnitude) assessed using birefringence is also clarified thanks to the effective absence of impurity traps. A surface recombination model, extended for nonradiative recombination at dislocations due to diffusion, is proposed to explain the temperature dependence from 4 to 300 K, which facilitates the derivation of the radiative lifetime. The proposed model is generally applicable to a mixture of excitons and carriers in a wide range of materials with high exciton binding energies.
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