Anomalous enhancement of nanodiamond luminescence upon heating

作者：Khomich A A; Kudryavtsev O S; Dolenko T A; Shiryaev A A; Fisenko A V; Konov V I; Vlasov I I^*

来源：Laser Physics Letters, 2017, 14(2): 025702.

DOI：10.1088/1612-202X/aa52f5

• nanodiamond
• meteorite diamond
• temperature dependence
• hydrogen bonds
• photo-luminescence

Characteristic photoluminescence (PL) of nanodiamonds (ND) of different origin (detonation, HPHT, extracted from meteorite) was studied in situ at high temperatures in the range 20-450 degrees C. 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 ND luminescence related to ND surface defects increases almost an order of magnitude upon heating to 200-250 degrees C. The observed effect reveals that water adsorbed on ND surfaces efficiently quenches PL; water desorption on heating leads to dramatic increase of the radiative de-excitation.

• 出版日期2017-2