Dr. Huan-Cheng Chang - Far-UV Excited Luminescence of Nitrogen-Vacancy Centers: Evidence for Diamo

Far-UV Excited Luminescence of Nitrogen-Vacancy Centers: Evidence for Diamonds in Space

Hsiao-Chi Lu,*^,1 Yu-Chain Peng,¹ Sheng-Lung Chou,¹ Jen-Iu Lo,¹ Bing-Ming Cheng,*^,1,2 and Huan-Cheng Chang*^,3,4

¹National Synchrotron Radiation Research Centre, No. 101, Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan, Republic of China

²Department of Science and Environmental Studies, The Education University of Hong Kong, 10 Lo Ping Road, Tai Po, New Territories, Hong Kong

³Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan, Republic of China

⁴Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan, Republic of China

Angew. Chem. Int. Ed. 56, 14469–14473 (2017).

The nitrogen-vacancy (NV) centers in diamond are among the most thoroughly investigated defects in the solid state of matter; however, our understanding of their properties upon far-UV excitation of the host matrix is limited. The knowledge is crucial for the identification of NV as the carrier of extended red emission (ERE) bands detected in a wide range of astrophysical environments. Here, we report a study on the photoluminescence spectra of NV-containing nanodiamonds excited with synchrotron radiation over the wavelength range of 125 – 350 nm. We observed, for the first time, the emission at 520 – 850 nm with a quantum yield greater than 20 %. Our results share multiple similarities with the ERE phenomena, suggesting that nanodiamonds are a common component of dust in space. [link]

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