ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The photoluminescence (PL) from 100 nm diamond particles induced by infrared (IR) pulsed excitation [λexc=1064 nm (1.16 eV), τ=10 ns] was observed. The laser light intensity dependence of the PL yield shows that this is the five-photon absorption process (the total energy of excitation 5.8 eV). The PL results from structure defects, impurities, and the graphite-like phase excited by a relaxation of the multiphoton (MP)—produced electron–hole pairs (the band gap of diamond Eg=5.5 eV). By using the ultraviolet one-photon excitation [λexc=354.7 nm (3.48 eV), τ=10 ns], the same PL bands were observed in support of the correctness of interpretation. The typical Swan bands of electronically excited C2 species dominate the spectra at the IR light intensity above the threshold for vaporization. It was concluded that the MP-excited PL precedes the emission accompanying the laser vaporization process. © 1999 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.122998
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