Dual-Phase Glass Ceramic: Structure, Dual-Modal Luminescence, and Temperature Sensing Behaviors

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• 作者：Daqin Chen ; Zhongyi Wan ; Yang Zhou ; Xiangzhi Zhou ; Yunlong Yu ; Jiasong Zhong ; Mingye Ding ; Zhenguo Ji
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 2, 2015
• 年：2015
• 卷：7
• 期：34
• 页码：19484-19493
• 全文大小：724K
• ISSN：1944-8252

文摘

Yb³⁺/Er³⁺/Cr³⁺ triply doped transparent bulk glass ceramic containing orthorhombic YF₃ and cubic Ga₂O₃ nanocrystals was fabricated by a melt-quenching route to explore its possible application in optical thermometry with high spatial and temperature resolution. It was experimentally observed that Yb³⁺/Er³⁺ ions incorporated into the precipitated YF₃ nanophase, while Cr³⁺ ions partitioned into the crystallized Ga₂O₃ nanophase after glass crystallization. Importantly, such spatial isolation strategy efficiently suppressed adverse energy transfer among different active ions. As a consequence, intense green anti-Stokes luminescence originated from Er³⁺: ²H_11/2,⁴S_3/2 鈫?⁴I_15/2 transitions, and deep-red Stokes luminescence transitions assigned to Cr³⁺: ²E 鈫?⁴A₂ radiation were simultaneously realized. Impressively, the intermediate crystal-field environment for Cr³⁺ in Ga₂O₃ made it possible for lifetime-based temperature sensing owing to the competition of radiation transitions from the thermally coupled Cr^{3+ 2}E and ⁴T₂ excited states. In the meantime, the low-phonon-energy environment for Er³⁺ in YF₃ was beneficial for upconversion fluorescence intensity ratio-based temperature sensing via thermal population between the ²H_11/2 state and ⁴S_3/2 state. The Boltzmann distribution theory and the two-level kinetic model were adopted to interpret these temperature-dependent luminescence of Er³⁺ and Cr³⁺, respectively, which gave the highest temperature sensitivities of 0.25% K^鈥? at 514 K for Er³⁺ and 0.59% K^鈥? at 386 K for Cr³⁺.