Journal of Luminescence 

About: Journal of Luminescence is an academic journal published by Elsevier BV. The journal publishes majorly in the area(s): Photoluminescence & Luminescence. It has an ISSN identifier of 0022-2313. Over the lifetime, 18192 publications have been published receiving 321880 citations.

Correlation between the lowest triplet state energy level of the ligand and lanthanide(III) luminescence quantum yield

Abstract: The luminescence properties of 41 different Eu(III) and Tb(III) chelates that were synthesized with the purpose of developing new markers for chemical and biochemical applications were measured in aqueous solution and their suitability for labels in time-resolved immunoassays were evaluated. In spite of the influence of numerous factors on the luminescence quantum yields, a clear correlation was obtained between the energies of the lowest triplet state levels of the ligands and lanthanide (III) luminescence quantum yields of the respective chelates. Simultaneously Eu(III) and Tb(III) ions were observed to accept energy by their several different 5Dj, resonance levels depending on the energy of the lowest triplet state level of the ligand, and the Tb(III) luminescence quantum yields were observed to decrease due to the energy back transfer from excited Tb(III)∗ to the ligand when the energy difference between the 5D4 level of Tb(III) and the lowest triplet state energy level of the ligand is less than 1850 cm−1.

Fluorescence quantum yields of some rhodamine dyes

Abstract: Fluorescence quantum yields of seven rhodamine dyes were measured relative to quinine sulfate dihydrate (QSH) in 1.0 N H 2 SO 4 . The values obtained were rhodamine 6G (0.95), B (0.65), 3B (0.45), 19 (0.95), 101 (0.96), 110 (0.92), 123 (0.90) at 25.0°C. Effects of temperature on the quantum yields of rhodamine B and QSH show a large temperature coefficient for rhodamine B and a significant one for QSH. Dye concentration was found to be critical in reporting observed fluorescence wavelength maxima.

Energy of the first 4f7→4f65d transition of Eu2+ in inorganic compounds

Abstract: fd-excitation, absorption, reflection, and df-emission spectra presented in the literature on Eu2+ in inorganic compounds have been gathered and re-analyzed. Emission wavelength, width of the emission band, absorption wavelength, Stokes shift, and redshift pertaining to Eu2+ in more than 300 different compounds (fluorides, chlorides, bromide, iodides, oxides, sulfides, selenides, and nitrides) are presented. From the data, it is possible to predict for each of the 13 lanthanide ions (La2+, Ce2+, Pr2+, until Yb2+), doped in any of the compounds compiled, the energy of the transition from the 4fn ground state to the first 4fn−15d level and also the energy of df-emission. A brief overview on the relationships between redshift, Stokes shift, and the width of the emission with the type of compound is given.

The 5d level positions of the trivalent lanthanides in inorganic compounds

Abstract: The literature on 4f n ↔4f n −1 5d transitions of the trivalent lanthanides in inorganic compounds has been collected. From critically analyzing fd-excitation, absorption, reflection and df-emission spectra, values for the spectroscopic red shift of 5d levels and the stokes shift were determined. Data pertaining to 368 different lanthanide sites in over 300 different compounds (fluorides, chlorides, bromide, iodides, oxides, sulfides, selenides and oxy-nitrides) has been compiled. From the data, it is possible to predict for each of the 12 lanthanide ions ( Ce 3+ , Pr 3+ until Yb 3+ ) doped in any of the compounds compiled, the position of the lowest 5d levels with typically ±600 cm −1 accuracy.

Point defects and luminescence centres in zinc oxide and zinc oxide doped with manganese

Abstract: The green and yellow luminescence centres in ZnO and Mn-doped ZnO are investigated. Water vapour enhances green luminescence of ZnO in the surface, and causes a two band luminescence phenomenon (green and yellow35in the bulk. Mn behaves as quencher for both the green and the yellow luminescence of ZnO. Positron lifetime measurements show the existence of at least two distinct vacancy-type defects in all materials. At the present time it seems that a VZn · V0 divacancy exists, and that luminescence is due to interstitial zinc and oxygen.