LaAlO₃:Dy³⁺ perovskite for white light emitting phosphors suitable for display devices

In this report, LaAlO₃:Dy³⁺ nanophosphors were synthesized via combustion synthesis utilizing sucrose as a fuel. The phase of the prepared phosphors was confirmed by Powder X-Ray Diffraction (PXRD) pattern which exhibited rhombohedral pure phase. The optical band gap of the fabricated phosphors was estimated to be of the range of 5.28–5.47 eV. The nanoparticle structure of the prepared nanophosphors is examined with the scanning electron microscope (SEM) images. Transmission electron microscope (TEM) image was taken to access the crystallite size of the prepared samples. Under excitation wavelength of 352 nm, the photoluminescence (PL) emission peaks centered at 490 nm 560 nm, and 666 nm attributed to Dy³⁺ ions characteristics. The effect of quenching on luminescence has been explored in detail. The CIE coordinates lie in the white emission with the color purity (CP) of 67%. The quantum efficacy (QE) of the prepared nanophosphors was found to be ~70%. The cathodoluminescence studies of the prepared LaAlO₃:Dy³⁺ phosphors were performed at RT and showed good CL intensity at low voltage. These outcomes validate the prominence of LaAlO₃:Dy³⁺ phosphors to be used in the field of photovoltaic and display devices.