| Autor: |
Mal, Dibya Kanti, Das, Soumitra, Nigam, Sandeep, Mandal, B. P., Kaiwart, Rahul, Poswal, H. K., Sudarsan, V., Majumder, C., Tyagi, A. K. |
| Předmět: |
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| Zdroj: |
New Journal of Chemistry; 10/28/2024, Vol. 48 Issue 40, p17411-17422, 12p |
| Abstrakt: |
Although the smaller size of nanophosphors renders processability and flexibility for next-generation devices, concurrent surface prolificity stifles the phosphor efficiency, and in turn, their superiority. To circumvent the surface side effect in the Y2Sn2O7:Eu nanophosphor, the present work articulates a co-substituent (Zr4+)-assisted revival of stifled luminescence. Steady-state and time-resolved photoluminescence studies revealed that with respect to nanophosphors without a Zr substituent, the Zr-substituted Y2Sn2−xZrxO7:Eu (x = 0.25, 0.5) pyrochlore nanophosphor exhibited multi-fold augmentation in lifetime and quantum efficiency values, which are key parameters for ascertaining the photoluminescence performance. The experimental and theoretical outcomes indicate that Eu3+ prefers to be in close proximity to Zr4+ ions in the Y2Sn2−xZrxO7:Eu (x = 0.25, 0.5) pyrochlore lattice to counterbalance the individual substitution consequences and generate appropriate electronic distributions and polar interactions. This proximity preference of Zr–Eu facilitates the occupation of Eu3+ in the interior region of nanoparticles and avoids the surface sensitivity. Furthermore, the lifetime values for the Y2Sn2−xZrxO7:Eu (x = 0.25, 0.5) pyrochlore nanophosphor are 5–6 ms, and the internal quantum efficiency is approximately 80%, which is the highest of any pyrochlore nanosized phosphor reported thus far, to the best of our knowledge. Thus, this work deciphered an innovative pathway for evasion of the surface-quenching effect without compromising homogeneity in the structural ordering and vicinal symmetry of the dopant/substituent across the dimensions of nanophosphors. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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