Thermoluminescence and phosphorescence in natural and synthetic semiconducting diamond
Thermoluminescence and phosphorescence in natural and synthetic semiconducting diamond
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DOI：
10.1016/0022-2313(71)90039-1
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发表时间：
1971-12
影响因子：
3.6
通讯作者：
P. Walsh;E. C. Lightowlers;A. T. Collins
中科院分区：
文献类型：
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作者：
P. Walsh;E. C. Lightowlers;A. T. Collins
天然和合成半导体金刚石以及天然和合成绝缘型Lb金刚石的热释光曲线在~150°K和~250°K处有两个峰。热释光是由带有⪆的光子或20keV电子激发的。由初始上升技术测得的激活能分别为0.18±0.05 eV和0.35±0.02 eV。天然金刚石的热释光发射光谱由中心位于1.85 eV和2.6 eV附近的两个谱带组成，磷光光谱也表现出类似的特征。激发过程中产生的电子和空穴导致补偿的施主和受主的中和。在激发期间或激发后不久，紧密分离的施主和受主上的电子和空穴以辐射方式重新结合，相对孤立的中心在低温下保持中性。在随后的加热过程中，从浅受主释放的空穴通过连续的捕获和再电离过程在可用的电离受主之间重新分配。当辐射复合发生时，热释光发光是由靠近中性施主的电离受主空穴俘获的结果。这与热释光过程中发光光谱分布从高能到低能的变化以及动力学级数的增加是一致的，本文将对此进行讨论。
Thermoluminescence glow curves from natural and synthetic semiconducting diamond, and from natural and synthetic insulating type lb diamonds, exhibit two peaks at ~ 150°K and ~ 250°K. The thermoluminescence has been excited either by photons withh⪆Egor by 20 keV electrons. Activation energies determined by the initial rise technique are 0.18 ± 0.05 eV and 0.35 ± 0.02 eV, respectively. For natural diamond the emission spectrum of the thermoluminescence glow consists of two bands centred near 1.85 eV and 2.6 eV, and the phosphorescence spectrum exhibits similar features. The creation of electrons and holes during excitation leads to the neutralization of compensated donors and acceptors. Electrons and holes on close separation donors and acceptors recombine radiatively during or shortly after excitation, and relatively isolated centres remain neutral at low temperatures. Holes released from shallow acceptors during subsequent heating are redistributed amongst available ionized acceptors by a continuous process of trapping and reionization. The thermoluminescence glow results from hole capture by ionized acceptors in close proximity to neutral donors when radiative recombination can take place. This is consistent with the change in spectral distribution of the glow from high to low energy during the thermoluminescence process and the increase in the order of kinetics which is discussed in the following paper.