We developed a deep-ultraviolet–visible photoacoustic (PA) spectroscopy system for the evaluation of nonradiative deactivation in phosphor materials. The system consists of a xenon arc lamp of 300 W with an aspherical condensing mirror, a monochromator, a mechanical chopper to modulate the monochromatic light at a certain frequency of 10–100 Hz, and a single optical fiber. The acoustic signal from the sample was counted with an electret microphone connected to a preamplifier, a sound level meter unit, and a lock-in amplifier. 0.25, 0.5, and 1.0 mol% Ce-doped Y3Al5O12 crystalline samples were evaluated for the performance test of the system. From the evaluation, an inverse correlation among fluorescence quantum efficiency, scintillation light yield, and PA signal was experimentally confirmed.
ASJC Scopus subject areas
- Materials Science(all)