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A novel double-perovskite LiLaMgTeO6: Mn4+ far-red phosphor for indoor plant cultivation white LEDs: Crystal and electronic structure, and photoluminescence properties
摘要： Deep-red-emitting Mn4t activated oxide phosphors are the hot research topic due to their potential applications in indoor plant cultivation LEDs. In this paper, a novel double-perovskite LiLaMgTeO6:Mn4t phosphor was firstly prepared by high-temperature solid-state reaction method and its structure of the phosphor was determined by X-ray diffraction (XRD) and Rietveld refinement. Density functional theory (DFT) calculations using VASP provide an insight into the bandgap and electronic structures of the LiLaMgTeO6 host. Under UV or blue excitation, LiLaMgTeO6:Mn4t shows a good stability and bright far-red light in the 540e800 nm range with the maximum at 708 nm, which matches well with the absorption band of phytochrome PFR, indicating its potential application in improving plant growth. The optimal Mn4t doping concentration was approximately 0.6 mol%. Furthermore, a white-LEDs device made of a 365 nm chip coated with present phosphor and commercial green, blue phosphors was designed for indoor plant cultivation. The results indicate that the LiLaMgTeO6: Mn4t phosphor possesses great application prospect in white-LEDs for plant cultivation.
关键词： Far red emission,Phytochrome,Double perovskite,LEDs,Thermal stability,Indoor plant cultivation
更新于2025-09-23 15:21:01
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A Cocktail of Multiple Cations in Inorganic Halide Perovskite towards Efficient and Highly Stable Blue Light-Emitting Diodes
摘要： Blue-emitting materials and their light-emitting diodes (LEDs) are always challenging in the application of lighting and display. Recently, perovskite LEDs (PeLEDs) with efficient and stable green/red emission have made great progress, where external quantum efficiency (EQE) over 20% has been reached. However, it is still a big challenge to realize stable blue PeLEDs with high efficiency mainly due to the poor film quality and unreasonable device structure. Herein, a cocktail strategy, that is, multi-cation (Cs/Rb/FA/PEA/K)Pb(Cl/Br)3 is demonstrated to improve both the efficiency and stability of blue PeLEDs. Combined with the “insulator-perovskite-insulator” structure, PeLEDs based on multi-cation (Cs/Rb/FA/PEA/K)Pb(Cl/Br)3 perovskite film show maximum EQE of 2.01% and maximum luminance of 4015 cd/m2 at 484 nm. More importantly, the device exhibits robust durability, and its half-lifetime is over 300 min under continuous operation. The multi-cation strategy could open up new avenue to design new blue-emitting materials for high-performing PeLEDs.
关键词： Stability,Multi-cation strategy,Perovskite LEDs,Blue-emitting materials,Efficiency
更新于2025-09-19 17:13:59