White light generation from HfO2 films co-doped with Eu3++ Tb3+ ions synthesized by pulsed laser ablation technique

White light employing luminescent engineered large (mega) Stokes shift molecules: a review

“…Emissions were observed at around 530 nm and 700 nm, which originated from a triplet metalperturbed intraligand ( 3 IL) excited state and charge transfer excited state character, respectively. Based on TDDFT study, it was conrmed that the spin density was predominantly localized on the organic moieties of the Pt complex, which further supported the 3 ILCT character for the low energy emission band ($700 nm). The enhanced coplanarity of the phenyl ring with the quinolinium moiety in the T 1 geometry and increased dipole moment from the S 0 to T 1 states are believed to contribute to the mega Stokes shi property of the complex.…”

“…Emission of the 1 MLCT band for the Ru complex was known to produce a large Stokes shi ($150 nm) and maximum wavelength reaching the NIR region of the spectrum. The longlived intensity decay, typically from 100 ns to 10 ms, was assigned to the triplet state 3 MLCT emission. If we are to compare the emission wavelength of the Ru complexes designed by AlAbbad et al, it is apparent that the band red-shied for the Ru metal that accommodated stronger electron withdrawing ligands.…”

“…[13][14][15] High quantum efficiency materials are a desirable characteristic in most imaging applications for the best display, illumination, and performance. In white light application, several efforts to design suitable chromophores have been done by different research groups, employing organic, 9 inorganic, 16 supramolecular chemistry, 17 polymer micelle, 18,19 biocomposite, 7 lanthanides doped phosphors, 3,20 quantum dot, 21 carbon dot, 22,23 and other approaches. Continuous efforts in experimenting with different types of white light emitting materials were inspired by the demand for cost effective production, usage of low toxicity materials, scarcity of resources that make up current materials, facile fabrication, green strategy and existing loopholes in generating a true white light.…”

“…It can thus appear as broadband or multi-band emission. Physical means to generate white light may involve the combination of a few specific kinds of light, such as compact and discrete red-green-blue (RGB) light-emitting diodes (LEDs), single phosphor based white LED, 1 uniform photonic crystal fiber using microchip laser, 2 lanthanides-doped film by pulsed laser ablation 3 or through the fabrication of multiphase phosphors on an ultraviolet-emitting diode. 4 Based on the former pathway, the generation of white light resulted from the process of color additive mixing.…”

Spray Pyrolysis Technique; High-K Dielectric Films and Luminescent Materials: A Review

“…[37,38]. They have been synthesized through a variety of physical and chemical techniques, including: Hidrothermal/Solvothermal [39,40,41], solid-state reaction [42], sol-gel [43,44], laser ablation [45,46], sputtering [47], Pechini Method [48], plasma electrolitic oxidation [49], conventional melt-quenching method [50,51], combustion synthesis [52], solvent evaporation method [53,54,55], and co-precipitation process [56]. Among these techniques, spray pyrolysis began to be used for this purpose in the mid-1980s, and it is still used today [57,58]—proving to be a practical, low cost, easy to extrapolate for large area deposition technique.…”