Fluorophosphate-based red fluorescent materials, their preparation methods and applications
By preparing the fluorophosphate-based red fluorescent material K2+2xCa1-y-xEuyPO4F, the problems of reabsorption effect and low ultraviolet light utilization in white LEDs were solved, achieving red light supplementation without reabsorption and enhancing plant photosynthesis.
Patent Information
- Application Number
- CN202410680235.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2026-09-01
- Estimated Expiration
- 2044-05-29
AI Technical Summary
Existing commercial red phosphors exhibit reabsorption effects in white LEDs, leading to decreased luminous efficiency. Meanwhile, ultraviolet light has minimal impact on plant photosynthesis. Therefore, it is necessary to develop red phosphors with large Stokes shifts to optimize the excitation and luminescence properties of Eu2+ and improve the utilization rate of sunlight by plants.
A fluorophosphate-based red fluorescent material, K2+2xCa1-y-xEuyPO4F, was prepared by a high-temperature solid-state reaction method. The cation vacancy defects in the crystal were repaired by the non-equivalent substitution of Ca by K. The excitation spectrum was 300–470 nm, with the optimal excitation wavelength at 350 nm and the strongest emission peak at 660 nm, avoiding overlap with commercial yellow phosphors.
It achieves red light supplementation without reabsorption effect in white LEDs, improves the color rendering index, and converts ultraviolet light into red light that is beneficial to plants, thereby improving plant growth cycle and agricultural product yield.