Large prolongation of free-exciton photoluminescence decay in diamond by two-photon excitation.
We report on time-resolved photoluminescence of a free-exciton in IIa chemical vapor deposition diamond crystal. Large difference between decay times for one- and two-photon excitation processes was observed. The longest room-temperature exciton photoluminescence lifetime τ(FE)=220 ns was obtained under two-photon excitation with a photon energy of 4.7 eV. The role of diffusion and surface recombination velocity in exciton photoluminescence dynamics was studied using a new optical method based on two-photon excited time-resolved photoluminescence. The measured room-temperature value of diffusion coefficient in diamond was D=40 cm(2)/s.
Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague 2, Czech Republic. ma.kozak@seznam.cz
Martin
M
Kozák
František
F
Trojánek
Petr
P
Malý
D000042:Absorption; D018130:Diamond / Q000737:chemistry*; D004583:Electrons; D008163:Luminescent Measurements / Q000379:methods*; D017785:Photons; D013499:Surface Properties
D018130:Diamond