The impact of nanocrystals size on luminescent properties and thermometry capabilities of Cr, Nd doped nanophosphors

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• 作者：L. Marciniak ; ^{l.marciniak@int.pan.wroc.pl" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; A. BednarkiewiczAuthor Vitae ; W. StrekAuthor Vitae
• 关键词：Tetraphosphates ; Luminescent thermometers ; Size effect ; Chromium
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：238
• 期：Complete
• 页码：381-386
• 全文大小：1774 K

文摘

Transition metal d-f emission based thermometry has recently proven to be an order of magnitude more sensitive than thermometers based on conventional f-f transitions in rare-earth ions. Little is known however about the susceptibility of these materials to nanoscale parameters, such as size or surface-to-volume ratio. Here we study the impact of nanocrystallite size on luminescent properties as well thermometry capabilities of CrNd co-doped LiLaP₄O₁₂ phosphors. In particular, we show that absolute emission intensity decreases (∼ 0.81%/nm), emission band position blue shifts (Δl ∼ −0.066 nm_{wave length}/nm_{grain size}), temperature sensing range narrows (from 300 to 600 K at 240 nm down to 300–420 K at 20 nm), temperature sensitivity rises up (from 1%/K to ∼5%/K) and temperature resolution drops (from ∼0.3 °C down to 0.05 °C) gradually, when the size of NCs decreases from 240 down to 20 nm, respectively. As a consequence, proper design of host and dopants, enables finding optimal materials for many thermometry applications.