PRESSURE-INDUCED BLUESHIFT OF ND3- NEAR-INFRARED PRESSURE SENSOR( FLUORESCENCE EMISSION IN YALO3 )

Pressure-induced shift of fluorescence emission in garnets and other o xides is investigated for applications as optical pressure sensors. We report high pressure studies on the fluorescence emission from neodym ium-doped yttrium aluminum perovskite (Nd3+:YAlO3) to 80 GPa at room t emperature. Unusual nonlinear blueshift of wavelength with pressure wa s found for several fluores cence peaks in the wavelength region of 85 0-900 nm. These peaks are identified as the lines associated with tran sition Nd3+:4F(3/2)-->I-4(9/2) in YAlO3. The blueshift of these emissi ons is compared with the redshift of the same system in neodymium-dope d yttrium aluminum garnet (Nd3+:Y3Al5O12). The shift with pressure is related to the change in the Stark level splitting with pressure. In v iew of the strong red emission from diamond anvils at ultrahigh pressu res, this near infrared emission of Nd3+:YAlO3 holds promise as an ult rahigh pressure sensor. (C) 1997 American Institute of Physics.