Huge exchange energy and fine structure of excitons in an organic-inorganic quantum well material
Huge exchange energy and fine structure of excitons in an organic-inorganic quantum well material
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DOI：
10.1103/physrevb.73.241310
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发表时间：
2006-06-01
影响因子：
3.7
通讯作者：
Davies, J. J.
中科院分区：
文献类型：
--
作者：
Ema, K.;Umeda, K.;Davies, J. J.
研究了低温下有机-无机量子阱材料（C4H9NH3）(2)PbBr4中激子的光致发光和自旋翻转拉曼散射。强约束和像电荷效应极大地提高了激子的估计交换能，其范围在28 ~ 32 meV之间。这些值比由更常见的无机材料制成的量子阱的值大一到两个数量级。偶极子允许激子的振子强度与暗激子（禁止偶极子）激子的振子强度之比估计为800数量级。
Photoluminescence and spin-flip Raman scattering of excitons in an organic-inorganic quantum well material (C4H9NH3)(2)PbBr4 have been investigated at low temperature. The estimated exchange energy of the exciton is greatly enhanced by strong confinement and by image charge effects, and ranges from 28 to 32 meV. These values are one or two orders of magnitude larger than those for quantum wells made from the more usual inorganic materials. The ratio of the oscillator strength of the dipole-allowed exciton to that of the dark (dipole-forbidden) exciton is estimated to be of order 800.