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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A single-phased tunable emission phosphor MgY2Si3O10: Eu3+, Bi3+ with efficient energy transfer for white LEDs
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A single-phased tunable emission phosphor MgY2Si3O10: Eu3+, Bi3+ with efficient energy transfer for white LEDs

机译：单相可调谐发射磷光体MgY2Si3O10：Eu3 +，Bi3 +，具有有效的能量转移，可用于白色LED

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摘要

A novel single-phased tunable emitting phosphor MgY2Si3O10: Bi3+, Eu3+ has been synthesized by a conventional high temperature solid-state method. X-ray diffraction (XRD), photoluminescence emission and excitation spectra were utilized to characterize the as-synthesized samples. Under UV-light pumping, MgY2Si3O10: Bi3+ showed characteristic blue emission corresponding to the P-3(1) -> S-1(0) transition of Bi3+ ions, and MgY2Si3O10: Eu3+ showed characteristic red emission corresponding to the D-5(0) -> F-7(J) (J = 1, 2, 3, 4) transition of Eu3+ ions. Spectra indicate that Bi3+ ions occupy two nonequivalent sites in the MgY2Si3O10 matrix, namely, Bi3+(I) and Bi3+(II). The two sites (Bi3+(I) and Bi3+(II)) exhibit broad emission peaks at 411 nm and 490 nm, respectively. Efficient energy transfer between these two Bi3+ sites has been proven using the spectra. The spectral overlap between the emission spectrum of Bi3+ and the excitation spectrum of Eu3+ allows for resonance-type energy transfer to occur from Bi3+ to Eu3+. The efficient energy transfer from Bi3+ to Eu3+ via a dipole-quadrupole interaction mechanism is significantly demonstrated by comparing experimental data with theoretical calculations. According to the concentration quenchingmethod, the critical distance of energy transfer from Bi3+ to Eu3+ is calculated to be 13.2 angstrom. As it is a new phosphor, CIE coordinates and CCT temperature, in addition to efficient energy transfer have been also investigated in detail. White light emission for MgY2Si3O10: n Bi3+, m Eu3+ can be realized through controlling the concentrations of Bi3+ and Eu3+. All of the results indicate that MgY2Si3O10: n Bi3+, m Eu3+ is a potential phosphor for white light UV-LEDs.
机译：通过常规高温固态法合成了新型的单相可调发射磷光体MgY2Si3O10：Bi3 +，Eu3 +。利用X射线衍射（XRD），光致发光发射和激发光谱来表征合成后的样品。在紫外光泵浦下，MgY2Si3O10：Bi3 +表现出与Bi3 +离子的P-3（1）-> S-1（0）跃迁相对应的特征性蓝色发射，而MgY2Si3O10：Eu3 +显示与D-5（ 0）-> F-7（J）（J = 1，2，3，4）跃迁Eu3 +离子。光谱表明，Bi3 +离子在MgY2Si3O10基质中占据两个非等价位，即Bi3 +（I）和Bi3 +（II）。这两个位点（Bi3 +（I）和Bi3 +（II））分别在411 nm和490 nm处显示宽发射峰。使用光谱已证明了这两个Bi3 +位点之间的有效能量转移。 Bi3 +的发射光谱和Eu3 +的激发光谱之间的光谱重叠使得共振型能量从Bi3 +转移到Eu3 +。通过将实验数据与理论计算进行比较，可以证明通过偶极-四极相互作用机制从Bi3 +到Eu3 +的有效能量转移。根据浓度猝灭法，能量从Bi 3+转移到Eu 3+的临界距离为13.2埃。由于它是一种新型的荧光粉，因此除了有效的能量转移外，还详细研究了CIE坐标和CCT温度。 MgY2Si3O10的白光发射：n Bi3 +，m Eu3 +可以通过控制Bi3 +和Eu3 +的浓度来实现。所有结果表明，MgY2Si3O10：n Bi3 +，m Eu3 +是白光UV-LED的潜在荧光粉。

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