Fig. 3From: Eu2+-Activated Green-Emitting Phosphor Obtained from Eu3+ Ions doping Zeolite-3A in Air Surroundings and Its Efficient Green Light-Emitting Diodesa PL emission spectra for zeolite-3A: 1.3 wt% Eu phosphors sintered at different temperatures, respectively. The inset shows the magnifying spectra. b photoluminescence excitation (PLE) and photoluminescence (PL) emission spectra for zeolite-3A: 1.3 wt% Eu phosphors sintered at 1400 °C for 3 h. The inset is the photograph of the sample with the illuminaton of a 365-nm UV lampBack to article page