| 简介 |
FIELD : physics.
SUBSTANCE : photoluminophor of the neutral-white light with the garnet structure based on the oxides of rare earth elements and the elements of subgroups IIIa, has the following chemical formula : (ΣLn, Bi)3[Σ(Ml)2][AlO4-x(F, N)x]3, where Ln - lanthanides Y, Ce, Lu, Tb; Ml - B, Al, Ga; [X]≤0.2 of atomic shares. The photoluminophor has a crystallographic garnet structure belonging to space group 1a3d, with the cubic crystal lattice parameter "a" of more than 12 angstroms (Å) increasing with the concentration growth of Ce3+. The neutral-white LED includes a nitride heterostructure GaInN 1 and a heterophase equal-thickness reradiative converter 4 being in contact therewith, made of the radiation resistant polycarbonate as a dispersion medium and 12-26% of the above photoluminophor as a dispersion phase. The thickness of converter 4 is 60-120 microns. The LED also includes a tapered ceramic light-collector 6 with the inner surface reflectivity of 96%, and a hemispherical cap 7 from the optically transparent polymer, the curvature radius of which is selected so that the focal point is at the geometric center of the reradiative converter 4.
EFFECT : photoluminophor of the neutral-white light has a high thermal stability.
6 cl, 10 dwg, 1 tbl |
客服热线：
手机版
二维码
