Color tuning of Bi3+-doped double-perovskite Ba2(Gd1−x,Lux)NbO6 (0 ≤ x ≤ 0.6) solid solution compounds via crystal field modulation for white LEDs

THE PYROPHANITE – ECANDREWSITE SOLID - SOLUTION : CRYSTAL STRUCTURES OF THE Mn 1 – xZnxTiO 3 SERIES ( 0 . 1 ≤ x ≤ 0 . 8 )

The crystal structure of members of the pyrophanite–ecandrewsite solid-solution series, Mn1–xZnxTiO3 (0.1 ≤ x ≤ 0.8 apfu), synthesized by ceramic methods in air at ambient pressure, has been characterized by Rietveld analysis of powder X-ray-diffraction patterns. All of these compounds crystallize with the ilmenite structure and adopt space group R3̄. The maximum solubility of Zn in MnTiO3 is co...

Polymer-Free Films of Inorganic Halide Perovskite Nanocrystals as UV-to-White Color-Conversion Layers in LEDs

Lead(II) bromide (PbBr2, 99.999% trace metals basis), lead(II) iodide (PbI2, 99.999% trace metals basis), cesium carbonate (Cs2CO3, reagentPlus, 99%), iodine (I2, 99.99%), hydrochloric acid (HCl, ACS reagent, ≥ 37%), hydriodic acid (HI, 57wt.% in H2O), hydrobromic acid (HBr, 48 wt. % in H2O, ≥99.99%), indium(III) acetate (In(Ac)3, 99.99%), copper(I) iodide (CuI, purum, ≥99.5%), 1-dodecanethiol ...

Warm white light generation from a single phase Dy3+ doped Mg2Al4Si5O18 phosphor for white UV-LEDs.

A series of Mg2-xAl4Si5O18:xDy(3+) (0 ≤x≤ 0.18) samples were synthesized, for the first time, by a solid state method both in a reducing atmosphere and in air. XRD, diffuse reflectance spectra, excitation spectra, emission spectra, decay times and thermal quenching were used to investigate the structure, photoluminescence, energy transfer and thermal properties. The results show that Mg2Al4Si5O...

Nanophosphors for White Light Leds

Tuning the correlated color temperature of white LED with a guest-host liquid crystal.

We demonstrate an electro-optic method to tune the correlated color temperature (CCT) of white light-emitting-diode (WLED) with a color conversion film, consisting of fluorescent dichroic dye doped in a liquid crystal host. By controlling the molecular reorientation of dichroic dyes, the power ratio of the transmitted blue and red lights of the white light can be accurately manipulated, resulti...