LED solid-state lighting devices with high efficiency, energy saving, environmental protection, etc., after decades of development has basically replaced the traditional incandescent, fluorescent lamps and become a new generation of light sources. Phosphor with wavelength conversion function, LED white light in determining the performance such as color rendering index, Color temperature, efficiency and so plays an important role, is one of the key materials for LED lighting devices, research and development of high efficiency and thermal stability of the phosphor has been the pursuit of people.
Chinese Academy of Sciences Ningbo Institute of Materials Technology and Engineering Institute of Advanced Manufacturing Technology Photoelectric Functional Materials and Devices team to develop a new type
Silicate cyan phosphor, and its fluorescence quantum efficiency can maintain 94% at room temperature, showing good thermal stability at 160 ℃ .This research was awarded one national invention patent and the related result was published in Advanced Optical Materials.
The team around
Material, use
Quantum tailoring and resonance energy transfer effect, obtained a luminous efficiency of up to 144% of the green phosphor to achieve the visible light quantum tailoring; first observed
Of the unusual red emission, the use of low-temperature spectral tracing back to the source of red light; on this basis, through
Co-doped single white light obtained by the national invention patents, the relevant basic research results published in The Journal of Physical Chemistry C, Materials Research Bulletin.
Recently, the team combined theory with experimentation at
The research on the regulation of the luminescent properties of the base cyan phosphors shows that the internal quantum efficiency of the fluorescence increases to 90% through the optimization of the process, and the light decay is less than 10% under the condition of 85 ° C / 85% RH for 1600 hours or more. Red powder compound, you can get on the NUV chip color rendering index of more than 90. Based on the right
First-principles calculation and understanding of the electronic structure, combined with the experimental means of spectroscopy, the team proposed a method for calculating the bandgap of a wide band gap inorganic non-metallic material matrix and reveal the thermal stability of the material luminescence mechanism, in addition to thermal harmony Sub-interactions can cause luminescence quenching, the heat-induced material absorption rate is another reason leading to thermal quenching of luminescent materials.
In addition, the team will
The steady-state fluorescence quantum yield of yellow afterglow phosphor is raised to 82%, which provides a potential rare earth luminescent material for solving the problem of AC LED strobe. Related Content Two national invention patents were applied. Some of the research results were published in Chemical Communications.
Research by the National Natural Science Foundation of Zhejiang Province, public technology fund, Ningbo Natural Science Fund.
Figure 1. Corresponding journal cover
Figure 2.Ba
9Lu
2Si
6O
24: Ce
3+Properties of near - ultraviolet white LED devices fabricated from cyan and pink phosphors
Figure 3.Gd
3Al
2Ga
3O
12: Ce
3+Yellow afterglow phosphor luminescence lighting and afterglow spectrum
