<br>SiO2-LaF3 溶胶凝胶纳米微晶玻璃中 Pr3+ 离子的白光和近红外发射,Nanoscale

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SiO2-LaF3 溶胶凝胶纳米微晶玻璃中 Pr3+ 离子的白光和近红外发射
Nanoscale ( IF 5.8 ) Pub Date : 2024-02-01 , DOI: 10.1039/d3nr04030e
Natalia Pawlik ₁ , Tomasz Goryczka ₂ , Maciej Zubko _{2,

3} , Joanna Śmiarowska ₁ , Wojciech A Pisarski ₁

Affiliation

在这项工作中，我们报告了使用溶胶-凝胶法合成的SiO ₂ -LaF ₃ :Pr ³⁺纳米玻璃陶瓷的结构和发光性能的研究结果。基于 XRD、显微 (TEM) 和 ATR-IR 测量，LaF ₃纳米晶体的结晶被 Pr ³⁺离子有利地占据，并且硅酸盐溶胶-凝胶主体内的整体转变取决于所制备的非晶的热处理条件对干凝胶进行了表征。制备的氟氧化物纳米玻璃陶瓷显示出绿蓝色（ ³ P _0,1 → ³ H ₄ , ³ P _0,1 → ³ H ₅ ）、红橙色（ ³ P _0,1 → ³ H ）内的发射₆ 、 ¹ D ₂ → ³ H ₄ 、 ³ P ₀ → ³ F _2,3 ) 和 NIR 光谱范围 ( ¹ D ₂ → ³ F ₄ 、 ¹ G ₄ 、 ¹ G ₄ → ³ H ₅ 、 ³ F _{3、 4} → ³ H ₄ )。根据 VIS 范围内的发光光谱，计算 CIE 色度坐标、相关色温 (CCT) 和颜色纯度 (CP)。所得结果清楚地表明，制备的 Pr ³⁺掺杂溶胶凝胶纳米微晶玻璃表现出暖色或中性白光发射，CCT 值在 2567 K 至 3962 K 范围内。最低 CP 值估计为 12.8% ，表明制造的样品能够发出明亮的白光。此外，NIR 发射涵盖 E、S、C 和 L 频段，这对于电信技术中适用的设备非常重要。为了进一步表征，估计了τ ( ³ P ₀ ) 和τ ( ¹ D ₂ ) 衰减时间。已确定 Pr ³⁺离子的³ P ₀和¹ D ₂激发态的发射以及交叉弛豫 (CR) 过程的参与取决于结晶 LaF ₃相的尺寸、分布非晶相和结晶相之间的光学活性 Pr ³⁺离子的数量（确定 Pr ³⁺ –Pr ³⁺离子间距离），以及制备的溶胶-凝胶基质中 OH 基团的相对含量。

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White light and near-infrared emissions of Pr3+ ions in SiO2-LaF3 sol–gel nano-glass-ceramics

In this work, we report the results of our investigations on the structural and luminescence properties of SiO₂-LaF₃:Pr³⁺ nano-glass-ceramics synthesized using the sol–gel method. Based on XRD, microscopic (TEM), and ATR-IR measurements, the crystallization of LaF₃ nanocrystals favorably occupied by Pr³⁺ ions and overall transformations within the silicate sol–gel hosts dependent on heat-treatment conditions of the as-prepared amorphous xerogels were characterized. The fabricated oxyfluoride nano-glass-ceramics revealed the emissions within the greenish-blue (³P_0,1 → ³H₄, ³P_0,1 → ³H₅), reddish-orange (³P_0,1 → ³H₆, ¹D₂ → ³H₄, ³P₀ → ³F_2,3), and NIR spectral scopes (¹D₂ → ³F₄,¹G₄, ¹G₄ → ³H₅, ³F_3,4 → ³H₄). Based on the luminescence spectra in the VIS range, the CIE chromaticity coordinates, correlated color temperatures (CCT), and color purities (CP) were calculated. The obtained results clearly indicate that the prepared Pr³⁺-doped sol–gel nano-glass-ceramics exhibit warm or neutral white light emissions with CCT values in the range from 2567 K to 3962 K. The lowest CP value was estimated at 12.8%, indicating that the fabricated samples are able to emit bright white light. Additionally, the NIR emissions cover E, S, C, and L bands, which are important for devices applicable in telecommunication technologies. For further characterization, the τ(³P₀) and τ(¹D₂) decay times were estimated. It was established that the emissions from the ³P₀ and the ¹D₂ excited states of Pr³⁺ ions, as well as the participation of cross-relaxation (CR) processes, are dependent on the size of crystallized LaF₃ phase, distribution of optically active Pr³⁺ ions between amorphous and crystalline phase (determining the Pr³⁺–Pr³⁺ inter-ionic distances), and relative content of OH groups in the prepared sol–gel hosts.

更新日期：2024-02-01

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