Time-resolved photoluminescence measurements
were carried out using
a confocal microscope setup (PicoQuant, MicroTime 200). A 405 nm pulsed
diode laser (PDL 828 “SEPIA II”, PicoQuant, pulse width
∼100 ps) was focused onto the surface of the microcrystalline
powder sandwiched between two glass coverslips using an air objective
(20 ×, 0.4 NA). The emission signal was separated from the excitation
light using a dichroic mirror (Z405RDC, Chroma). Repetition rates
of 0.2 MHz were used with an average energy density of 2.5 μJ/cm2. Photoluminescence photon arrival times were binned in 400
ps intervals.
were carried out using
a confocal microscope setup (PicoQuant, MicroTime 200). A 405 nm pulsed
diode laser (PDL 828 “SEPIA II”, PicoQuant, pulse width
∼100 ps) was focused onto the surface of the microcrystalline
powder sandwiched between two glass coverslips using an air objective
(20 ×, 0.4 NA). The emission signal was separated from the excitation
light using a dichroic mirror (Z405RDC, Chroma). Repetition rates
of 0.2 MHz were used with an average energy density of 2.5 μJ/cm2. Photoluminescence photon arrival times were binned in 400
ps intervals.