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Ultrafast Self-Crystallization of High-External-Quantum-Efficient Fluoride Phosphors for Warm White Light-Emitting Diodes
- Zhou, Wenli, Fang, Mu-Huai, Lian, Shixun, Liu, Ru-Shi
- ACS applied materials & interfaces 2018 v.10 no.21 pp. 17508-17511
- color, crystals, ethanol, fluorides, light emitting diodes, solvents, temperature
- In this study, we used HF (as good solvent) to dissolve K₂GeF₆ and K₂MnF₆ and added ethanol (as poor solvent) to cause ultrafast self-crystallization of K₂GeF₆:Mn⁴⁺ crystals, which had an unprecedentedly high external quantum efficiency that reached 73%. By using the red phosphor, we achieved a high-quality warm white light-emitting diode with color-rendering index of Rₐ = 94, R9 = 95, luminous efficacy of 150 lm W–¹, and correlated color temperature at 3652 K. Furthermore, the good–poor solvent strategy can be used to fast synthesize other fluorides.