纳米金刚石发光在加热时的反常增强
Anomalous enhancement of nanodiamond luminescence upon heating
摘要：
在20- 450 ℃范围内的高温下原位研究了非常不同来源（爆轰、HPHT、从陨石中提取）的纳米金刚石（ND）的特征光致发光（PL）。使用473 nm激光激发发光并在500-800 nm范围内记录。与块体金刚石中点缺陷PL随温度的降低相反，我们发现，当加热到200-250 ℃时，与ND表面缺陷相关的纳米金刚石发光增加几乎一个数量级。观察到的效果表明，吸附在ND表面的水有效地猝灭的光致发光，水解吸加热导致显着增加的辐射去激发。
英文摘要：
Characteristic photoluminescence (PL) of nanodiamonds (ND) of very different origin (detonation, HPHT, extracted from meteorite) was studied in situ at high temperatures in the range 20-450C. Luminescence was excited using 473 nm laser and recorded in the range 500-800 nm. In contrast to decrease of point defect PL in bulk diamond with temperature, we found that the nanodiamond luminescence related to ND surface defects increases almost an order of magnitude upon heating to 200-250 C. The observed effect reveals that water adsorbed on ND surfaces efficiently quenches photoluminescence, water desorption on heating leads to dramatic increase of the radiative de-excitation.
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