Research progress of rare earth luminescent materials for LED materials used by Ningbo Institute of Materials
LED solid-state lighting devices have the advantages of high efficiency, energy saving, and environmental protection. After more than ten years of development, they have basically replaced traditional incandescent and fluorescent lamps and become a new generation of lighting sources. The phosphor has a wavelength conversion function and plays an important role in determining the white light performance of the LED, such as color rendering index, color temperature, and efficiency. It is one of the key materials for the LED lighting device. The phosphor with high research and development efficiency and good thermal stability has been It is the goal pursued by people.
Photovoltaic functional materials and devices team of Institute of Advanced Manufacturing Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, developed a new type 
The silicate cyan phosphor has a fluorescence quantum efficiency of 94% at room temperature at 160°C, showing good thermal stability. The study was awarded a national invention patent and the relevant results were published on Advanced Optical Materials.
The team is surrounded by 
Material, use 
Quantum cutting and resonance energy transfer effect, a green phosphor with luminous efficiency up to 144% was obtained, and visible light quantum trimming was achieved; 
Abnormal red light emission, traced back to the source of red light using low-temperature spectroscopy; on this basis, 
Co-doped single white light was obtained. Obtained one of the national invention patents and related basic research results are published in The Journal of Physical Chemistry C, Materials Research Bulletin.
Recently, the team has combined theory and experimentation. 
Systematic studies have been conducted on the regulation of the luminescence properties of phosphors based on blue phosphors. Through the optimization of the process, the internal quantum efficiency of fluorescence is improved to 90%, and the decay of light within 1600 hours at 85°C/85%RH is less than 10%. Only the cyan fluorescent powder and the red powder are compounded, and white light having a color rendering index of 90 or more can be obtained on the NUV chip. Based on First-principles electronic structure calculations and understanding, combined with spectroscopic experimental characterization, the team proposes a method for calculating the band gap of a wide band gap inorganic non-metallic material, and reveals the thermal stability mechanism of the material's luminescence, in addition to thermal harmony. The sub-interaction can cause quenching of the luminescence, and the decrease in the absorption rate of the material caused by heat is another cause of thermal quenching of the luminescent material. The relevant results were published in the Journal of Materials Chemistry C.
In addition, the team will 
The steady-state fluorescence quantum efficiency of the yellow afterglow phosphor is increased to 82%, which provides a potentially valuable rare earth luminescent material for solving the AC LED strobe problem. The related content has applied for 2 national invention patents, and some research results have been published on Chemical Communications.
The research work was supported by the National Natural Science Foundation of China, the Zhejiang Provincial Philanthropy Technology Fund, and the Ningbo Natural Science Foundation.
Figure 1. The corresponding journal cover
Figure 2. Performance of near-ultraviolet white LED devices fabricated with Ba9Lu2Si6O24:Ce3+ cyan and red powders
Figure 3. Gd3Al2Ga3O12: Ce3+ Yellow Afterglow Phosphor Illumination Illumination and Afterglow Spectroscopy
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