White organic light-emitting diodes based on a novel Zn complex with high CRI combining emission from excitons and interface-formed electroplex

Color-tunable and white-light emitting lanthanide complexes based on (CexEuyTb1−x−y)2(BDC)3(H2O)4

“…Similarly, the colors changed from green to red with increasing Eu 3+ , which were caused by the enhanced red and quenched green simultaneously by increasing Eu 3+ concentrations. The same fact illustrated in these two figures showed that the colors fall in white region with the ratio of Ce 3+ :Tb 3+ :Eu 3+ to be 3.0:2.0:0.15, and the composition is (Ce 0.583 Eu 0.029 Tb 0.388 ) 2 (BDC) 3 …”

“…PXRD patterns of all the complexes synthesized with various Ce 3+ , Eu 3+ and Tb 3+ ratios were consistent with previous reports [19], indicating that the lanthanide complexes were isostructural, and the chemical compositions were determined as (Ce x Eu y Tb 1−x−y ) 2 (BDC) 3 (H 2 O) 4 , which were also confirmed by the results of EA. High agreement between the experimental and calculated data were found from the EA results (Experiment/Calculated) for Ce 2 (BDC) 3 The thermal properties of the as-synthesized lanthanide complexes were investigated by the TGA experiment in which a weight loss of four coordinated water molecules at about 120 • C could be observed in all cases. For convenient calculation, the weight losses (Experiment/Calculated) of the three complexes containing only one kind of lanthanide ion, Tb 2 (BDC) 3 (H 2 O) 4 , Eu 2 (BDC) 3 (H 2 O) 4 and Ce 2 (BDC) 3 (H 2 O) 4 which were used as the reference samples, were compared and found to be 7.79%/8.16%, 8.34%/8.29% and 8.84%/8.49%, respectively.…”

“…In the PL spectra of the complexes containing only one kind of lanthanide ion, Tb 2 (BDC) 3 lanthanide ion were found without the broad-band emission of ligands, indicating the pure light colors and efficient energy transfer from the lowest triplet state of the ligands to excited states of the lanthanide ions [21][22][23][24]. The PL intensity of Tb 3+ was found to be the highest among the three kinds of ions, followed by Eu 3+ and Ce 3+ (the weakest), indicating the best match between the 5 D 4 energy level of Tb 3+ and the lowest triplet state of the ligands.…”

“…In recent years, white-light emitting materials have attracted much research interests due to their extensive applications in various areas such as panel display, imaging, illumination and so on [1][2][3]. Currently, the most commonly employed white-light emitting fluorescent materials were the inorganic salt and/or oxide doped with rare earth or transition metal ions [4][5][6][7], while whitelight emission from organic molecules have also been reported [8][9][10][11].…”

Emitting materials based on phenylanthracene-substituted naphthalene derivatives for organic light-emitting diodes

“…These observations suggest that the contributions of the other than excimers of 1 and 2 to EL processes of devices using these materials are significant. In some multilayer OLEDs, a bimolecular recombination state called electromers [12][13][14][15][16][17] or electroplexes [18][19][20][21][22] was observed. Electromer is a bimolecular recombination state between hole and electron in EML [12,13].…”