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首页> 外文期刊>RSC Advances >Influence of citrate on phase transformation and photoluminescence properties in LaPO4 and LaPO4:Eu
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Influence of citrate on phase transformation and photoluminescence properties in LaPO4 and LaPO4:Eu

机译：柠檬酸盐对LaPO4和LaPO4：Eu中相变和光致发光性质的影响

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The hexagonal and monoclinic phase LaPO _(4) and LaPO _(4) :Eu nanostructures have been controllably synthesized by a citrate-induced hydrothermal process at 100 °C. The crystal growth of LaPO _(4) nanostructures was investigated, and the phase transformation of nanostructured LaPO _(4) was systematically studied by varying the citrate concentration, pH value and reaction temperature. When 0.8 mmol of citrate was added into the reaction system, the hexagonal phase LaPO _(4) transformed into the monoclinic phase. High concentrations of citrate would lead to the formation of hexagonal phase LaPO _(4) . The photoluminescence properties of the monoclinic phase LaPO _(4) :Eu prepared using a citrate-induced process demonstrate that the electric dipole transition ( ~(5) D _(0) → ~(7) F _(2) ) is stronger than the magnetic dipole transition ( ~(5) D _(0) → ~(7) F _(1) ), which indicated that Eu ~(3+) is in a site with no inversion center. The strongest emission peak of hexagonal phase LaPO _(4) :Eu comes from ~(5) D _(0) → ~(7) F _(1) . Furthermore, the citrate-induced hexagonal phase LaPO _(4) :Eu has a stronger emission intensity than the hexagonal phase LaPO _(4) :Eu prepared not using a citrate-induced process.
机译：六方相和单斜相LaPO _（4）和LaPO _（4）：Eu纳米结构已通过柠檬酸盐诱导的100°C水热过程可控地合成。研究了LaPO _（4）纳米结构的晶体生长，并通过改变柠檬酸盐浓度，pH值和反应温度系统地研究了纳米结构的LaPO _（4）的相变。当将0.8mmol柠檬酸盐添加到反应系统中时，六方相LaPO_（4）转变成单斜晶相。高浓度的柠檬酸盐将导致六方相LaPO_（4）的形成。用柠檬酸盐诱导的方法制备的单斜晶相LaPO _（4）：Eu的光致发光特性表明，电偶极跃迁（〜（5）D _（0）→〜（7）F _（2））更强比磁偶极跃迁（〜（5）D _（0）→〜（7）F _（1）），表明Eu〜（3+）处在没有反转中心的位置。六角相LaPO _（4）：Eu的最强发射峰来自〜（5）D _（0）→〜（7）F _（1）。此外，柠檬酸盐诱导的六角相LaPO_（4）：Eu具有比不使用柠檬酸盐诱导的方法制备的六角相LaPO_（4）：Eu更强的发射强度。

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