Figure 4
From: Microstructure and optical properties of Pr3+-doped hafnium silicate films
PL spectra, schematics, and PL behavior. (a) PL spectrum in logarithmic scale for 1,000°C annealed layer. (b) The schematics of the Pr3+ intra-4f transitions. (c) PL spectra of the films annealed at different annealing temperatures (TA= 800°C to 1,100°C). The excitation wavelength is 285 nm. (d) The behavior of the PL intensity of the 3P0→3H4 transition at 487 nm with TA.