Multi-wavelength tailoring of a ZnGa₂O₄ nanosheet phosphor via defect engineering

Abstract

The multi-wavelength tailoring of ZnGa2O4 nanosheets has been achieved via a defect engineering approach. Controlling the distortion of [GaO6] octahedron and the formation of [GaO4] tetrahedron and oxygen vacancy in ZnGa2O4 lattice can achieve the simultaneous emissions of ultraviolet/blue, green and red wavelengths.

Concentration and pump power-mediated color tunability, optical heating and temperature sensing via TCLs of red emission in an Er3+/Yb3+/Li+ co-doped ZnGa2O4 phosphor

“…Rare earth doped zinc gallate phosphors have been given much interest due to their wide applications in a variety of elds, such as lighting, eld emission display devices (FEDs), and plasma display panels (PDPs). [53][54][55] It contains an optical band gap of the order of 4.4 eV. 56 ZnGa 2 O 4 is known as a self-activated host and it emits blue luminescence without doping any activator ion.…”

Visible to Near‐Infrared Persistent Luminescence and Mechanoluminescence from Pr3+‐Doped LiGa5O8 for Energy Storage and Bioimaging

“…The PersL intensities are weakened as the delay time is prolonged while no peak shift occurs indicating the existence of stable PersL centers. Interestingly, we also found that the PersL of host disappears once Pr 3+ ions are doped in, and this may be due to energy transfer from host to Pr 3+ ions . PersL decay curves of Li 0.995 Ga 5 O 8 :0.005Pr 3+ monitored at 495 nm are also plotted in Figure c.…”

“…Figure a presents the PersL spectra of LiGa 5 O 8 as a function of delay times (2, 4, 6, 8, and 10 s) recorded after irradiation by a 254 nm lamp for 60 s, and the powder image detected at the delay time of 2 s is shown in the inset. To our knowledge, the structural defects can also trigger discrete energy levels in the forbidden band, and produce defect‐related luminescence centers . Here, the blue PersL of LiGa 5 O 8 may be ascribed to the self‐activation of Ga‐O in the [Ga2O 4 ] tetrahedra.…”

“…Under the excitation by 254 nm light, LiGa 5 O 8 shows broad emissions covering the visible range peaked at 415 nm in the near UV part. Here, compared to the PersL peak at 437 nm, the blue shift may correspond to the self‐activation of Ga‐O in the [Ga1O 6 ] octahedra . However, when Li + ions are substituted by Pr 3+ ions, the PL spectra of all the as‐prepared samples present similar emission bands from 330 to 700 nm with emission band from host and five obvious sharp peaks at 495, 511, 621, 644, and 666 nm which correspond to the 3 P 1 → 3 H 4 , 3 P 0 → 3 H 4 , 1 D 2 → 3 H 4 , 3 P 0 → 3 H 6 , and 3 P 0 → 3 F 2 transitions of Pr 3+ ions, respectively .…”

Multi-responsive deep-ultraviolet emission in praseodymium-doped phosphors for microbial sterilization

“…For the O 1s spectrum (Fig. 1d), it can be fitted into two peaks, which correspond to V O (peak at the low energy) and the lattice O (peak at the high energy) [35]. Moreover, the V O peak shifted to higher binding energies and its intensity decreased as Pr 3+ was introduced into the host lattice, indicating that the number of V O decreased.…”