Luminiscent materials as spectral converters: power dependent profiling of solid NaYF4: Yb3+, Er3+ UCNP as highly efficient NIR to UVA-Blue emission

BARJA, BEATRIZ C.; GRECCO, HERNÁN E.; CLAUDIA MARCHI, M.; BUJJAMER, JUAN M.

Simposio; . Exploring the Frontiers of Chemistry: Challenges for the 21st Century? Chemistry symposium; 2020

FCEN - UBA University of Buenos Aires - Ben-Gurion of the Negev University (Israel

Upconversion is a common process in lanthanides-based materials in which absorption of multiple low energy photons result in a high energy one. The emission spectrum is frequentlytuned by changing the composition of the material. However, a commonly overlooked aspect is the non-linear power dependence which can influence the spectral and temporalproperties of the emission. Moreover, as upconverting materials have been shown to increase the output current density in photovoltaic cells when used as spectral converters, thecomplete power profile is required to calculate the improved efficiency and needs to be incorporated in the design process. In this work, we show that solid NaYF4:Yb3+,Er3+upconversion nanoparticles, well known for the green-red emission, can also emit efficiently in the UVA-blue range. In addition, we characterized their stationary and dynamicluminescence features as a function of incident power to reveal the relevant intra-band mechanisms.