Self-activated luminescent properties of zinc metaphosphate glasses enhanced by Tb3+ and Eu3+ doping for color tunability

IF 3.6 3区 物理与天体物理 Q2 OPTICS
M. Hamed Misbah , Zaynab Ghubish , Emam F. El Agammy
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引用次数: 0

Abstract

Self-activated zinc metaphosphate (ZnP) glasses co-doped with Eu2O3 and/or Tb4O7, corresponding to the formula xEu2O3∙0.2Tb4O7∙(49.8-x)ZnO∙50P2O5 (x = 0, 0.2, 0.4, 0.6 mol%), were synthesized using the melt quenching technique. X-ray diffraction (XRD) confirmed the amorphous nature of all the prepared glasses. Fourier Transform Infrared (FTIR) spectroscopy revealed the characteristic metaphosphate network structure, which remained largely unchanged upon doping with Eu2O3 and/or Tb4O7. Under the UV-light illumination, ZnP glass exhibited intrinsic blue emission centered around 450 nm under UV excitation, which is attributed to intrinsic defects. Furthermore, the doped ZnP with Tb4O7 or Eu2O3 resulted in the characteristic green and red emissions due to the 5D47FJ transitions of Tb3+ and 5D07FJ transitions of Eu3+, respectively. In contrast, the co-doped ZnP with Eu2O3 and Tb4O7 resulted in yellow color emission. The UV–Visible, excitation, and photoluminescence spectra of the prepared matrices demonstrated efficient energy transfer from the self-activated ZnP host matrix to the Tb3+ and Eu3+ ions, as well as energy transfer from Tb3+ to Eu3+ ions. By adjusting the Eu3+ concentration and the excitation wavelength, the emission color could be precisely tuned across the green-white-red spectrum. CIE 1931 chromaticity coordinates confirmed the color tunability, shifting from green (0.253, 0.514) towards white (0.335, 0.428) and further towards red under different excitation conditions and doping levels. These results suggest that Tb3+/Eu3+ co-doped ZnP glasses are promising candidates for developing color-tunable phosphors for solid-state lighting applications.
掺杂Tb3+和Eu3+增强偏磷酸锌玻璃的自激活发光性能
采用熔体淬火技术合成了Eu2O3和/或Tb4O7共掺杂的自活性偏磷酸锌(ZnP)玻璃,其分子式为xEu2O3∙0.2Tb4O7∙(49.8-x)ZnO∙50P2O5 (x = 0,0.2, 0.4, 0.6 mol%)。x射线衍射(XRD)证实了所制备玻璃的无定形性质。傅里叶变换红外光谱(FTIR)揭示了其特有的偏磷酸盐网络结构,在掺杂Eu2O3和/或Tb4O7后基本保持不变。在紫外光照射下,ZnP玻璃在紫外光激发下呈现出以450 nm为中心的本征蓝色发射,这是由于本征缺陷造成的。此外,由于Tb3+的5D4→7FJ跃迁和Eu3+的5D0→7FJ跃迁,掺杂Tb4O7或Eu2O3的ZnP分别产生了特征性的绿色和红色发射。相比之下,与Eu2O3和Tb4O7共掺杂的ZnP则产生黄色发光。制备的ZnP基质的紫外可见光谱、激发光谱和光致发光光谱表明,自激活ZnP基质能够有效地将能量从Tb3+和Eu3+离子转移到Tb3+和Eu3+离子,以及Tb3+向Eu3+离子的能量转移。通过调整Eu3+浓度和激发波长,可以在绿-白-红光谱上精确地调整发射颜色。CIE 1931色度坐标证实了颜色的可调性,在不同的激发条件和掺杂水平下,从绿色(0.253,0.514)到白色(0.335,0.428),再到红色。这些结果表明,Tb3+/Eu3+共掺杂ZnP玻璃是开发用于固态照明应用的颜色可调荧光粉的有希望的候选者。
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来源期刊
Journal of Luminescence
Journal of Luminescence 物理-光学
CiteScore
6.70
自引率
13.90%
发文量
850
审稿时长
3.8 months
期刊介绍: The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.
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