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电荷转移状态介导的红色和近红外上转换辐射在NaLaS2:Yb/Tm
Ruizhu Fan1, Ying Tian1, Zechun Xie1
1Department of Applied Physics, School of Science, Dalian Maritime University, Dalian 116026, China.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy
|December 25, 2025
概括
这项研究介绍了NaLaS2:Yb3+,Tm3+,一种新型材料,可以发射红色和近红外光,用于深层组织生物成像. 它还展示了高性能光学温度计,超越了现有的Yb3+,Ln3+联合剂材料.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 生物医学光学 生物医学光学
背景情况:
- 生物光学窗口 (600-1100 nm) 对于深层组织成像至关重要,因为吸收和散射率低.
- 像NaYF4这样的常规材料经常表现出不良的蓝色排放,阻碍了应用.
- 开发具有光学窗口排放的稳定材料对于先进的生物成像和传感是必不可少的.
研究的目的:
- 为了合成和描述NaLaS2:Yb3+,Tm3+的发光特性.
- 为了研究这种材料在生物光学窗口内用于深层组织生物成像的潜力.
- 为了评估其作为光学温度计传感器的性能.
主要方法:
- 合成NaLaS2:Yb3+,Tm3+ 的合成.
- 在980nm激发下进行光学表征,包括排放光谱分析.
- 使用光强度比 (FIR) 在303-573 K的温度范围内评估热传感性能.
主要成果:
- 观察到强红 (≈696 nm) 和近红外 (≈797 nm) 辐射,落在生物光学窗口内.
- 由于电荷转移状态相互作用,NaLaS2宿主抑制了Tm3+蓝色排放.
- 该材料达到0.122K-1的最大绝对灵敏度 (SA) 和0.896%K-1的相对灵敏度 (SR),优于其他Yb3+,Ln3+联合合样本.
结论:
- NaLaS2:Yb3+,Tm3+是一种化学稳定的材料,具有强烈的红色和NIR辐射,适合深层组织生物成像.
- 该材料在光学温度计方面表现出色,具有很高的灵敏度.
- 这种多功能材料对先进的生物医学应用具有重大前景.
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