Development and Performance Test of Deep Ultraviolet-Visible Photoacoustic Spectroscopy System for Nonradiative Deactivation Characterization in Phosphor Materials

摘要

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 Y_3Al_5O_(12) 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.