Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 119, Issue 35, Pages 20571-20577Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b04819
Keywords
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Funding
- National Natural Science Foundation of China [51132004, 51072054]
- National Basic Research Program of China [2011CB808100]
- Natural Science Foundation of Guangdong Province [S2011030001349]
- Fundamental Research Funds for the Central Universities [2013ZM0001, 2014QNA4006]
- State Key Laboratory of High Field Laser Physics (Shanghai Institute of Optics and Fine Mechanics)
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BaCuSi4O10 (Han blue), CaCuSi4O13 (Egyptian blue), and SrCuSi4O10 are pigments found in many ancient artifacts all over the world. Behind their brilliant color, we demonstrate here that these ancient pigments are strong candidates for photonic materials due to their bright Stokes and anti-Stokes emissions. These pigments give near-infrared emissions (NIR) from Cu2+ centered at around 930 nm under excitation of 440-800 nm light. This NIR emission can also be produced by pumping using a NIR laser diode. With the rise of pumping density, the emission bandwidth increases notably and stretches to the visible region, giving rise to bright and broadband photon upconversion (UC). This photon UC process is interpreted in terms of laser-driven blackbody radiation from the ancient pigments.
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