4ZrGe 3O 12: Bi 3+ for n-UV pumped light-emitting diodes]]>

摘要

AbstractA novel Bi3+activated Ca4ZrGe3O12phosphor was synthesized and the photoluminescence properties were investigated. Ca4ZrGe3O12:Bi3+could be efficiently excited in the wavelength range of 320–430?nm, and exhibit a broad emission band (400–520?nm) with a peak at 435?nm corresponding to the3P1–1S0transition of Bi3+. Due to the energy transfer between Bi3+ions, the concentration quenching in the Ca4ZrGe3O12host occurred when the concentration of Bi3+exceeded 2.25?mol %. Upon excitation at 370?nm, the internal quantum efficiency of the phosphor with different Bi3+concentration was measured, the highest value was determined to be 38.6%. Moreover, the phosphor exhibited excellent thermal stability and the corresponding activation energy ΔE was determined to be 0.228?eV. Due to the efficient excitation in the near ultraviolet (n-UV) region and the strong blue emission, Ca4ZrGe3O12:Bi3+would be a potential blue phosphor for n-UV pumped light-emitting diodes.Graphical abstractDisplay OmittedHighlights?Non-rare-earth activated garnet phosphor Ca4ZrGe3O12:Bi3+was synthesized.?Ca4ZrGe3O12:Bi3+could be efficiently excited by near UV lights.?Ca4ZrGe3O12:Bi3+gives blue emission with a QE about 38.6%.?Ca4ZrGe3O12:Bi3+exhibited excellent thermal stability.]]>