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We investigate the role of the Nd3+ content on the PA characteristics inNdxY1.00-xAl3(BO3)4 particles with x ranging from 0.05 to 1.00. It is knownthat the replacement of Y3 by Nd3+ into the YAl3(BO3)4 crystalline structurecan introduce strong modifications of the lattice properties as well as in thephotoluminescence characteristics, such as luminescence concentration quenchingand broadening of spectral lines. Despite that, we observe, for low x (<= 0.20)an energy-looping preceding the PA-like that ensues for x >= 0.40. It isassociated to the proximity among the Nd3+ ions, fundamental to the electricdipole-electric dipole interaction responsible for the Nd3+ energy transfer[4F3/2, 4I9/2] - [4I15/2, 4I15/2]. We discuss the present results focusing onemerging technologies with development of ultra-sensitive thermal sensors, andsuper-resolution imaging thanks to the giant nonlinearities in the input-outputpower dependences.

Energy-looping and photon-avalanche-like phenomena in NdxY1.00-xAl3(BO3)4 powders excited at 1064 nm