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Herein, we designed Er3+-incorporated zincate-based nanomaterials via a rapid, low-cost, and environmentally friendly urea-combustion route. X-ray powder diffraction (XRPD) profiles revealed their orthogonal crystalline structure. Electron microscopy showed nanoscale (48–70 nm) non-uniform agglomerated particles. The presence of [BaO11] and [ZnO5] structural units in the present samples was shown by Fourier-transform infrared (FT-IR) spectroscopy. Emission spectra yielded a characteristic peak at 551 nm, which contributed to their bright-green light. The optimal nanomaterial had 3.0 mol% of Er3+ content, and it exhibited excellent bright-green light. Exchange-type multipolar inter-linkages via cross-relaxation predominantly direct the quenching of luminescence post x = 0.03 Er3+ content, as shown by the Inokuti-Hirayama (I-H) model. The optical bandgap and Urbach energy were obtained from experimental data-fitting with Tauc's hypothesis and an empirical correlation. Excellent color-purity (87.86%) and color temperature (6916 K) with chromaticity coordinates (0.2531, 0.6106) of the optimized nanomaterial were similar to National Television Standards Committee (NTSC) and NICHIA Corporation fabricated light-emitting diode (LED) green standards. Hence, the developed nanomaterials appear to be a good candidates for generating cool-green light in high-performance blue/green/red (B/G/R) white-light-emitting diodes (wLEDs), sensors, and laser applications. [ABSTRACT FROM AUTHOR]

The present investigation reports the attractive characteristics of vivid-green light-emitting Ba5Zn4Gd8O21:Er3+ nanomaterials fabricated via an eco-friendly and energy-saving solution combustion approach in detail. The Rietveld refinement technique was implemented on x-ray diffraction (XRD) data to analyze the crystallographic features. The photoluminescence emission spectrum showed an extraordinary band at 550 nm when activated under near UV (at 378 nm) light. The highest intensity emission band is attained at 2.0 mol.% Er3+ ions, after which emission was quenched due to a dipole–dipole (d–d) inter-transmission phenomenon. Finally, the vivid-green emission had color coordinate values (0.2401, 0.4492), which were comparable to the standard coordinates of the European Broadcasting Union (EBU) system, making these nanoparticles a suitable green light-emitting constituent of advanced optoelectronic devices such as lasers and near-UV-activated light-emitting diodes (i.e., white-light-emitting diodes). [ABSTRACT FROM AUTHOR]