Exploiting the diverse photoluminescence behaviors of NaLuF4:xEu3+ nanoparticles and g-C3N4 to realize versatile applications in white light-emitting diode and optical thermometer

Abstract

To overcome the existence challenge of the luminescent materials in versatile applications, NaLuF4:xEu3+ nanopariticles and NaLuF4:0.15Eu3+@yg-C3N4 composites were designed. Under irradiation of 394 nm, dazzling red emissions with high color purity of 87.6% are observed in the NaLuF4:xEu3+ nanoparticles and the optimizing content of the dopants is 15 mol%. The electric dipole-dipole interaction leads to the concentration dependent quenching effect. Through assessing the resistance performance of the resultant nanoparticles to the temperature, the studied samples are certified to show high thermal stability. Furthermore, the proper color rendering index (80.2), low correlated color temperature (5014 K) and suitable luminous efficiency (12.1 lm/W) of packaged white light-emitting diode reveal that the NaLuF4:0.15Eu3+ nanoparticles can be employed as the red component for white light-emitting diode. On account of the inconsistent photoluminescence performances of the NaLuF4:0.15Eu3+ nanoparticles and g-C3N4, the thermometric properties of the NaLuF4:0.15Eu3+@yg-C3N4 composites are explored. The maximum absolute and relative sensitivities of the designed composites are 0.0057 K−1 and 0.455% K−1, respectively, and their values are able to be manipulated via composition regulation. This work proposes a new sight into the exploitation of diverse photoluminescence behaviors of the g-C3N4 and NaLuF4:xEu3+ nanoparticles to realize versatile applications.