Issue 59, 2016, Issue in Progress

Eu3+ local site analysis and emission characteristics of novel Nd2Zr2O7:Eu phosphor: insight into the effect of europium concentration on its photoluminescence properties

Abstract

A new zirconate-based pyrochlore-type red phosphor, Nd2Zr2O7:Eu3+, was synthesized using the gel-combustion method. The un-doped sample showed visible emission due to the presence of oxygen vacancies. On doping with europium ions, it was found that Eu was distributed into both Nd3+ as well as Zr4+ sites based on emission and lifetime spectroscopy with a lifetime value of 3.35 and 1.14 ms, respectively, although the population at the Zr4+ site is more than that at the Nd3+ site. This is also justified by the presence of two stark components in the 5D07F0 transition. The presence of host emission in the spectrum of Nd2Zr2O7:Eu3+ indicated incomplete energy transfer process at low levels of europium doping. Moreover, the efficiency of energy transfer increased as the doping percentage increased, and complete host-dopant energy transfer took place at 5.0% Eu3+ doping. Based on time resolved emission spectroscopy (TRES), the emission spectrum of europium into the Nd3+ sites as well as at Zr4+ sites was elucidated. Calculation of the Judd–Ofelt parameter illustrated that at all europium concentration, the local surrounding area lacks inversion symmetry (asymmetric environment) and the exact point group symmetry was found to be C4. The red purity and high quantum efficiency of Nd2Zr2O7:Eu3+ projects it to be a new materials for commercial application in white light emitting diodes.

Graphical abstract: Eu3+ local site analysis and emission characteristics of novel Nd2Zr2O7:Eu phosphor: insight into the effect of europium concentration on its photoluminescence properties

Supplementary files

Article information

Article type
Paper
Submitted
05 May 2016
Accepted
16 May 2016
First published
19 May 2016

RSC Adv., 2016,6, 53614-53624

Eu3+ local site analysis and emission characteristics of novel Nd2Zr2O7:Eu phosphor: insight into the effect of europium concentration on its photoluminescence properties

S. K. Gupta, C. Reghukumar and R. M. Kadam, RSC Adv., 2016, 6, 53614 DOI: 10.1039/C6RA11698A

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