Luminescence properties in relation to controllable morphologies of Ba3[Ge2B7O16(OH)2](OH)(H2O):Eu3+ and its thermal conversion product Ba3Ge2B6O16:Eu3+

摘要

Three types of morphologies of Eu ~(3+) -doped Ba _(3) [Ge _(2) B _(7) O _(16) (OH) _(2) ](OH)(H _(2) O) phosphors were obtained via hydrothermal reactions by different kinds of raw materials. In addition, Ba _(3) Ge _(2) B _(6) O _(16) :Eu ~(3+) phosphors were obtained by calcining the precursor Ba _(3) [Ge _(2) B _(7) O _(16) (OH) _(2) ](OH)(H _(2) O):Eu ~(3+) . The structure and morphology of the obtained samples were characterized by XRD, EDS, FT-IR, TG-DTA, SEM and HRTEM. Herein, the effects of the synthesis parameters, including the reaction temperature, boron sources and the rare earth doping dosage, on the photoluminescence (PL) properties of Ba _(3) [Ge _(2) B _(7) O _(16) (OH) _(2) ](OH)(H _(2) O) were investigated in detail. The lifetime and absolute quantum yield (QY) of different morphologies of Ba _(3) [Ge _(2) B _(7) O _(16) (OH) _(2) ](OH)(H _(2) O):Eu ~(3+) were also measured. The PL properties of the Ba _(3) Ge _(2) B _(6) O _(16) :Eu ~(3+) phosphor prepared by the precursor calcination method compared with those prepared by the high-temperature solid-state method are discussed.