LAUSR

LiPbB 5 O 9 :Eu 3+ phosphors were synthesized via solid-state reaction technique and studied various properties. For the prepared LiPbB 5 O 9 :Eu 3+ phosphors, structural and spectroscopic characterizations were performed. Crystallinity nature of LiPbB 5 O 9 :Eu 3+ phosphors was investigated from X-ray diffraction (XRD) analysis. Functional group investigations and maximum phonon energies of LiPbB 5 O 9 :Eu 3+ phosphor were studied via Fourier transform infrared spectroscopy (FTIR) analysis. The thermogravimetric (TG-DSC) analysis for LiPbB 5 O 9 :0.07Eu 3+ phosphor precursor was carried out in N 2 atmosphere up to 800 °C. From the TG-DSC analysis, weight loss of the precursor with temperature and endothermic temperatures was studied. The optical band gaps of LiPbB 5 O 9 :xEu 3+ phosphors for distinct Eu 3+ ions concentrations were found using diffuse reflectance spectra (DRS) analysis. Excitation spectra of LiPbB 5 O 9 :Eu 3+ phosphors were recorded at monitoring emission λ emi  = 614 nm wavelength, and emission spectra were recorded by monitoring excitation wavelength λ exc  = 393 nm. Energy transfer analysis of LiPbB 5 O 9 :Eu 3+ phosphor was studied with the Blasse and Dexter theories. Fluorescence lifetime decay curves of 5 D 0 level of Eu 3+ ions were analyzed at the above-mentioned excitation and emission wavelengths. From the emission spectral data, the CIE color coordinates and correlated color temperatures (CCT) were estimated. From the above investigations, it can be mentioned that LiPbB 5 O 9 :Eu 3+ phosphors find significant applications in white light emitting diodes as a red emitting phosphor.