The effect of alkali ions on the modification of various host matrices and their effects on the luminescence properties of lanthanide ions have been demonstrated in this comprehensive review.

Rare earth, Yb3+/Ho3+ doped NaYF4 nanophosphors co-doped with Mn2+ showed enhanced red emission under NIR irradiation and were successfully used for cancer cell imaging.

The infrared spectra

The complex of o-phenylenediamine (o-PDA) and benzoin (BN) was synthesized adopting solid state reaction by mixing of their melt together followed by chilling. The phase diagram study shows the formation of a complex in 1:1 molar ratio with congruent melting point and two eutectics lying on either side of complex. The formation of complex was confirmed using the FTIR, NMR, mass spectroscopy, powder XRD and DSC studies. The optical properties of the parent component, their complex and few other compositions nearby the complex were studied using absorption and laser luminescence techniques. The significantly higher green/yellow emission was noted with newly synthesized complex as compared to that of their parents as well as other compositions of o- PDA and BN.