Abstract
In this work, the synthesis and photoluminescence response of HfO2 doped with Eu3+ (HfO2:Eu3+) are reported. The synthesis was carried out by the hydrothermal route of HfCl4 and EuCl3 .6H2O with NH4OH dissolved in deionized water. To perform the hydrolysis, the precursors were subjected to hydrothermal treatment at 120°C, under autogenously pressure at reaction times of 24, 40, 52 and 72 hours. The synthesized nanoparticles were characterized by mean of X- ray diffraction (XRD), high resolution transmission electron microscope (HRTEM), and energy dispersive spectroscopy (EDS). Samples excited with 395 nm radiation show photoluminescence emission lines corresponding to the electronic transitions 5D0 → 7FJ (J = 0 → 4), characteristics of the Eu3+ ion. The photoluminescence emission intensity increases with the increasing of the reaction time, reaching a maximum at 72 hours. The excitation band peaked at 395 nm, makes this material an excellent candidate for applications in solid state white lamps.
Highlights
The luminescent materials has been subject of large number of investigations due its wide range of applications, among which we can include fluorescent lamps, flat screens, lasers, and different opto-electronic devices [1,2,3,4,5]
The synthesis and photoluminescence response of HfO2 doped with Eu3+ (HfO2:Eu3+) are reported
It was observed that the photoluminescence response is dependent on the reaction time, being obtained the best response at 72 hours of hydrothermal treatment
Summary
The luminescent materials has been subject of large number of investigations due its wide range of applications, among which we can include fluorescent lamps, flat screens, lasers, and different opto-electronic devices [1,2,3,4,5] These applications are often based on host materials with a wide band gap activated by rare-earth (RE) ions. Metal oxides are promising phosphor materials because of their wide band gap, low absorbance in the visible region and their chemical and thermal stabilities Among these oxides, the HfO2:Eu3+ (red emission) offers an excellent possibility for white LED applications, because, in addition to the oxides advantages, it has an intense absorption band at λ = 395 nm, which matches with the emission spectrum of GaN-based LEDs. In this research, the photoluminescence and structural properties of hafnium oxide doped with europium ions (HfO2:Eu3+) as a function of the hydrothermal reaction time, are reported
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