Abstract
This work aimed to explore the temperature-sensing performance of La2MgTiO6:Er3+ double perovskites based on thermally coupled and uncoupled energy levels. Furthermore, the crystal structure, chemical composition, and morphology of the samples were investigated by powder X-ray diffraction, energy-dispersive X-ray spectroscopy, and scanning electron microscopy, respectively. The most intense luminescence was observed for the sample doped with 5% Er3+. The temperature-dependent emission spectra of La2MgTiO6:5% Er3+ were investigated in the wide range of 77–398 K. The highest sensitivity of the sample was equal to 2.98%/K corresponding to the thermally coupled energy level 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 as compared to 1.9%/K, obtained for the uncoupled energy level 2H11/2 → 4I15/2 and 2H9/2 → 4I15/2. Furthermore, the 300 K luminescent decay profiles were analyzed using the Inokuti–Hirayama model. The energy transfer among Er3+ ions was mainly regulated by the dipole–dipole mechanism. The critical transfer distance R0, critical concentration C0, energy transfer parameter Cda, and energy transfer probability Wda were 9.81 Å, ions·cm−3, cm6·s−1, and 6020 s−1, respectively.
Highlights
Double perovskite compounds (DP) are among the most intensely studied materials because of their interesting chemical and physical properties, as well as their diverse applications stemming from the compositional flexibility of their structure
All samples crystallized in n orthorhombic structure with the space group Pbnm (62)
The chemical composition of the representative sample was in agreement with the theoretical chemical composition
Summary
Double perovskite compounds (DP) are among the most intensely studied materials because of their interesting chemical and physical properties, as well as their diverse applications stemming from the compositional flexibility of their structure. LMT:Er3+ published recently with regard to temperature readout application It was synthesized using the conventional solid-state method, the working temperature range was quite narrow, and it was only focused on thermally coupled levels [25]. Uncoupled levels, which are related to the phonon-assisted process, have gained significant attention for temperature sensing [18,27,28] This is due to the fact that the phonon-assisted process enhanced by elevating temperature is related to absorption, emission, and energy transfer. The aim of this work was to explore the temperature sensing performance of a novel double perovskite LMT:Er3+ as a function of the ratio of emission intensity of thermally coupled and uncoupled energy levels of Er3+ ions. The energy transfer mechanism among Er3+ ions and the characteristics of luminescent decay kinetics were clarified using the Inokuti–Hirayama model
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