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Highly Sensitive Upconverting Nanoplatform for Luminescent Thermometry from Ambient to Cryogenic Temperature.
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-07-10 , DOI: 10.1002/cphc.202000198 Kingshuk Mukhuti 1 , V N K B Adusumalli 2 , Heramba V S R M Koppisetti 2 , Bhavtosh Bansal 1 , Venkataramanan Mahalingam 2
ChemPhysChem ( IF 2.3 ) Pub Date : 2020-07-10 , DOI: 10.1002/cphc.202000198 Kingshuk Mukhuti 1 , V N K B Adusumalli 2 , Heramba V S R M Koppisetti 2 , Bhavtosh Bansal 1 , Venkataramanan Mahalingam 2
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Precise assessment of temperature is crucial in many physical, technological, and biological applications where optical thermometry has attracted considerable attention primarily due to fast response, contactless measurement route, and electromagnetic passivity. Rare‐earth‐doped thermographic phosphors that rely on ratiometric sensing are very efficient near and above room temperature. However, being dependent on the thermally‐assisted migration of carriers to higher excited states, they are largely limited by the quenching of the activation mechanism at low temperatures. In this paper, we demonstrate a strategy to pass through this bottleneck by designing a linear colorimetric thermometer by which we could estimate down to 4 K. The change in perceptual color fidelity metric provides an accurate measure for the sensitivity of the thermometer that attains a maximum value of 0.86 K−1. Thermally coupled states in Er3+ are also used as a ratiometric sensor from room temperature to ∼140 K. The results obtained in this work clearly show that Yb3+−Er3+ co‐doped NaGdF4 microcrystals are a promising system that enables reliable bimodal thermometry in a very wide temperature range from ultralow (4 K) to ambient (290 K) conditions.
中文翻译：
用于从室温到低温的发光测温的高灵敏度上转换纳米平台。
在许多物理，技术和生物应用中，温度的精确评估至关重要，在这些应用中，光学测温法主要由于快速响应，非接触式测量路径和电磁无源性而引起了人们的广泛关注。依靠比例感测的稀土掺杂热成像磷光体在室温附近和之上都非常有效。但是，取决于载流子在热辅助下向更高激发态的迁移，它们在很大程度上受到低温下激活机制的淬灭的限制。在本文中，我们设计了一种线性比色温度计，以证明可解决这一瓶颈的策略，据此我们可以估计低至4K。-1。Er 3+中的热耦合态也可以用作从室温到约140 K的比例传感器。这项工作获得的结果清楚地表明，Yb 3+ -Er 3+共掺杂的NaGdF 4微晶是有希望的系统，在从超低（4 K）到环境（290 K）的非常宽的温度范围内提供可靠的双峰测温。
更新日期：2020-07-10
中文翻译：
用于从室温到低温的发光测温的高灵敏度上转换纳米平台。
在许多物理，技术和生物应用中，温度的精确评估至关重要，在这些应用中，光学测温法主要由于快速响应，非接触式测量路径和电磁无源性而引起了人们的广泛关注。依靠比例感测的稀土掺杂热成像磷光体在室温附近和之上都非常有效。但是，取决于载流子在热辅助下向更高激发态的迁移，它们在很大程度上受到低温下激活机制的淬灭的限制。在本文中，我们设计了一种线性比色温度计，以证明可解决这一瓶颈的策略，据此我们可以估计低至4K。-1。Er 3+中的热耦合态也可以用作从室温到约140 K的比例传感器。这项工作获得的结果清楚地表明，Yb 3+ -Er 3+共掺杂的NaGdF 4微晶是有希望的系统，在从超低（4 K）到环境（290 K）的非常宽的温度范围内提供可靠的双峰测温。
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