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首页> 外文期刊>RSC Advances >Multi-color luminescence properties and energy transfer behaviour in host-sensitized CaWO4:Tb3+,Eu3+ phosphors
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Multi-color luminescence properties and energy transfer behaviour in host-sensitized CaWO4:Tb3+,Eu3+ phosphors

机译：主机敏化Cawo4：TB3 +，EU3 +荧光粉中的多色发光性能和能量转移行为

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摘要

A series of host-sensitized and color-tunable CaWO _(4) :Tb ~(3+) ,Eu ~(3+) phosphors were prepared via a high-temperature solid-state reaction route, and the crystal structure and luminescence properties, especially the energy transfer behavior, were investigated in detail. Under UV radiation, the CaWO _(4) host presents a broad emission band from about 320 to 600 nm centered around 415 nm, ascribed to the charge transfer in WO _(4) ~(2?) groups; while Eu ~(3+) and Tb ~(3+) ion doped CaWO _(4) samples show both host emission and respective emission lines derived from the characteristic f–f transitions of activators, which present abundant emission colors owing to an efficient energy transfer from the host to Eu ~(3+) /Tb ~(3+) ions. The energy transfer from the host to Eu ~(3+) and Tb ~(3+) was evidenced by directly observing appreciable overlap between the excitation spectrum of the host and the emission spectrum of Eu ~(3+) /Tb ~(3+) , as well as by the decreased decay time of host emission with increasing Eu ~(3+) /Tb ~(3+) concentration. The energy transfer mechanisms in CaWO _(4) :Eu ~(3+) /Tb ~(3+) phosphors have been determined to be a resonant type via dipole–dipole interaction. In the Eu ~(3+) and Tb ~(3+) co-doped system, CaWO _(4) :Eu ~(3+) ,Tb ~(3+) , the energy transfer phenomenon not only occurs from host to activators, but also from Tb ~(3+) to Eu ~(3+) , resulting in color-tunable emission including white light by simply adjusting the doping concentration of Eu ~(3+) and Tb ~(3+) ions. The PL properties of the as-prepared materials indicate their promising application in solid-state lighting fields.
机译：通过高温固态反应途径和晶体结构和发光性能制备一系列主机致敏和颜色可调谐的CAWO _（4）：TB〜（3+），EU〜（3+）磷光体，以及晶体结构和发光性能特别详细研究了能量转移行为，特别是能量转移行为。在紫外线辐射下，Cawo _（4）宿主呈现为约320至600nm的宽度发射带，其中心为415nm，归因于WO _（4）〜（2？）组的电荷转移;虽然欧盟〜（3+）和Tb〜（3+）离子掺杂的Cawo _（4）样品显示出宿主发射和各自的排放线，来自激活剂的特性F-F转变，这在效率上呈现丰富的发光颜色。从宿主到Eu〜（3+）/ Tb〜（3+）离子的能量转移。通过直接观察宿主的激发光谱和EU〜（3+）/ TB〜（3的发射光谱之间的明显重叠，通过从宿主到Eu〜（3+）和Tb〜（3+）的能量转移。（3 +），以及随着EU〜（3+）/ Tb〜（3+）浓度的增加，宿主发射的减少时间降低。 Cawo _（4）中的能量转移机制：Eu〜（3+）/ Tb〜（3+）磷光体已被确定为通过偶极偶极相互作用的共振型。在欧盟〜（3+）和TB〜（3+）共掺杂系统中，Cawo _（4）：Eu〜（3+），TB〜（3+），能量转移现象不仅从主持人出发活化剂，但也是从Tb〜（3+）到欧盟〜（3+），导致颜色可调发射，包括通过简单地调节Eu〜（3+）和Tb〜（3+）离子的掺杂浓度。制备材料的PL性能表明它们在固态照明场中的有希望的应用。

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