LED plant growth warm white fluorescent powder and preparation method thereof

Abstract

The invention discloses a LED plant growth warm white fluorescent powder and a preparation method thereof. The chemical formula of the fluorescent powder is RM<x>Y<y> (WO<4>)<3y / 2> (PO<4>)< (1 + 2X) / 3>: aEu<3+>, bMn<4+>, wherein R is one of Li, Rb, Cs or In, M is one of Ca, Sr, Ba or Mg, 0.1 < = x < = 0.75, 0.2 < = y < = 0.55, and 0.1 < = a < 0.8, 0.3<=b<2. The method comprises steps: grinding ina mortar, mixing R2CO3 and M3(PO3)2, dropwise adding a mixed solution of R2CO3 and M3(PO3)2, adding RMnO4, stirring, taking an obtained precipitate for hydrothermal reaction, and mixing with Eu2O3 toobtain a precursor powder; carrying out high-temperature firing in a reducing atmosphere, adopting an alkaline-earth metal and Y co-doped mixed tungsten phosphate system as a matrix material, codopingEu < 3 + > and Mn < 4 + > to serve as activated light-emitting particles, transferring excitation energy from R3 to sensitized Mn < 4 + >, carrying out gradient temperature control firing treatment after a precursor is prepared through a hydrothermal synthesis method, so that activity and light-emitting efficiency are improved, and concentration quenching effect is overcome. The problems of insufficient stability and deliquescence pollution are avoided, and the requirements of red fluorescent powder for growth of warm white LED plants are met.

Description

technical field [0001] The invention relates to an LED plant growth warm white fluorescent powder and a preparation method thereof, belonging to the technical field of fluorescent powder. Background technique [0002] LED plant growth light source has the functions of strengthening roots, promoting growth, regulating flowering period and flower color, promoting fruit ripening and coloring, improving taste and quality, and is more environmentally friendly and produced and used, so that phosphors for warm white LEDs have received widespread attention. Warm white light has higher lighting efficiency and less power consumption than cool white light. Warm white light needs to be able to produce red light well under the action of external energy and match it with blue LED chips. Therefore, the preparation of luminescent particles and luminescent substrates suitable for stable high-color rendering red phosphors can greatly improve the color purity and color purity of warm white lig...

AI Technical Summary

Problems solved by technology

[0003] The warm white LED plant growth red phosphors in the prior art generally use alkaline earth metal sulfide phosphors, which produce red phosphors with low wavelength and color temperature under the excitation of blue light or ultraviolet light, because the sulfur element in the system phosphors is easy to precipitate And react with oxygen in the air, resulting in poor chemical stability, there are deliquescence and damage to the crystal structure to reduce the luminous efficiency and color rendering index defects and sulfur pollution problems, even through the addition of auxiliary agents or surface treatment, there are still problems The problem of light attenuation performance is relatively large. At the same time, the sintering activity of the powder is reduced by the one-stage calcination directly using the high-temperature solid-state reaction method. The diffusion distance between atoms is large, resulting in more intermediate phases that affect the purity. Long sintering time consumes more energy. And affect the luminous efficiency of the phosphor