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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Enhancement emission intensity of CaMo0_4 : Eu~(3+), Na~+ phosphor via Bi co-doping and Si substitution for application to white LEDs
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Enhancement emission intensity of CaMo0_4 : Eu~(3+), Na~+ phosphor via Bi co-doping and Si substitution for application to white LEDs

机译：通过Bi共掺杂和Si替代来增强CaMo0_4：Eu〜（3 +），Na〜+荧光粉的发射强度，以用于白色LED

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摘要

Through the use of Bi as a co-activator and Si as a substituting element for the host lattice, red emitting Ca_(0.5)MoO_4 : Eu_(0.25-x)~(3+), Bi_x~(3+), Na~+_(0 .25) (x = 0, 0.005, 0.01, 0.05, 0.10, 0.15 and 0.20) and Ca_(0.5)Mo_(1-y),Si_yO_4 : Eu_(0.25)~(3+), Na~+_(0 25) (y = 0.005, 0.01, 0.02, 0.03, 0.04 and 0.05) phosphors were synthesized by the conventional solid state reaction method, respectively. The photo-luminescent results show all samples can be excited efficiently by UV (396 nm) and blue (467 nm) light and emit red light at 615 nm with line spectra, which are coupled well with the characteristic emission from UVLED and blue LED, respectively. In the Eu3+_Bi3+ co-doped system, both Eu~(3+) f-f transition and Bi~(3+) CT transition absorptions are observed in the excitation spectra, the intensities of the main emission line (~5D_0 _ú~7F_2 transition of Eu~(3+) at 615 nm) are strengthened because of the energy transition from Bi~(3+) to Eu~(3+). The introduction of Si~(4+) ions did not change the position of the peaks but enhanced the emission intensity of Eu~(3+) under 396 nm excitations. The results showed that the optimal doping concentration of Bi~(3+) ions and Si~(4+) ions was 1 mol%, respectively.
机译：通过使用Bi作为共激活剂和Si作为主体晶格的替代元素，红色发射Ca_（0.5）MoO_4：Eu_（0.25-x）〜（3 +），Bi_x〜（3 +），Na〜 + _（0 .25）（x = 0、0.005、0.01、0.05、0.10、0.15和0.20）和Ca_（0.5）Mo_（1-y），Si_yO_4：Eu_（0.25）〜（3 +），Na〜通过常规的固态反应方法分别合成了+ _（0 25）（y ＝ 0.005、0.01、0.02、0.03、0.04和0.05）磷光体。光致发光结果表明，所有样品均可被紫外线（396 nm）和蓝光（467 nm）高效激发，并在615 nm处以线谱发射红光，并与UVLED和蓝光LED的特征发射良好耦合，分别。在Eu3 + _Bi3 +共掺杂体系中，在激发光谱，主发射谱线的强度（〜5D_0_ú〜7F_2跃迁）中都观察到Eu〜（3+）ff跃迁和Bi〜（3+）CT跃迁吸收。 Eu〜（3+）在615 nm处的能级增强）是由于从Bi〜（3+）到Eu〜（3+）的能量跃迁。 Si〜（4+）离子的引入并没有改变峰的位置，但在396 nm激发下增强了Eu〜（3+）的发射强度。结果表明，Bi〜（3+）离子和Si〜（4+）离子的最佳掺杂浓度分别为1 mol％。

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