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Supersensitive Sm 2+ ‐Activated Al 2 O 3 Thermometric Coatings for High‐Resolution Multiple Temperature Read‐Outs from Luminescence
Author(s) -
Ćirić Aleksandar,
Stojadinović Stevan,
Ristić Zoran,
Zeković Ivana,
Kuzman Sanja,
Antić Željka,
Dramićanin Miroslav D.
Publication year - 2021
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.202001201
Subject(s) - luminescence , coating , materials science , aluminium , atmospheric temperature range , ceramic , oxide , analytical chemistry (journal) , metallurgy , nanotechnology , optoelectronics , chemistry , physics , chromatography , meteorology
The introduction of additional functionalities to materials is exceptionally important as it opens new applications for them. Aluminum, one of the most abundant and important materials, is coated with luminescent Sm 2+ ‐doped γ‐aluminium oxide to impart thermometric functionality. Considering the potential industrial applications, two of the most widely used aluminum alloys, 6061 and 7075, are also coated. For this purpose, plasma electrolytic oxidation (PEO), an effective technique for producing hard ceramic coatings on various metal surfaces, is used. It is shown that thermometric coatings can be produced on aluminum in one‐step process by adding the raw precursor to the electrolyte. The valence reduction of Ln 3+ to Ln 2+ is achieved during the PEO process. The intense and broad (orange to deep red) emission from the coating shows supersensitivity to temperature changes over the 100–648 K range. The temperature is obtained from the coating emission using i) the emission intensity ratio method, ii) emission lifetime, and iii) emission band position with sensitivities of 4.8% K −1 , 1.2% K −1 , and 8 cm −1 K −1 , respectively. Several applications would benefit from the thermometric coating's excellent temperature resolution of 0.04 K and the choice of three temperature read‐outs that facilitate the coating's use in different luminescence thermometry setups.