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- W2808201400 abstract "Since the introduction of high brightness blue light-emitting diodes (LEDs), many phosphors have been investigated in order to convert a part of the blue emission into light with longer wavelengths. Using this strategy, white LEDs are produced which are now overtaking the lighting market because of their high efficiency. Among these LED conversion phosphors, Y3Al5O12:Ce3+ (YAG:Ce) has proven to be a benchmark in terms of efficiency as well as stability, explaining why it is used in most white LEDs on the market [1]. However, producing warm white light requires the addition of an extra red component in the phosphor blend. K2SiF6:Mn4+ (PSF) is a rare-earth free red phosphor that can enhance the color rendering of white LEDs with a minimal loss in efficiency due to its narrow emission in the red [2]. However, its stability should be investigated and improved if possible.In this work, the stability of the PSF phosphor is investigated using accelerated aging conditions. Samples are placed in a weathering chamber maintaining an ambient atmosphere of high temperature and high humidity to simulate real life stresses to which LED phosphors are subjected. Ex- and in-situ x-ray diffraction as well as TGA/DTA measurements are used to characterize the degradation of K2SiF6:Mn4+. MnO2 crystallization has been identified upon heating in the aged phosphor samples, indicating that oxygen has penetrated into the phosphor lattice, leading to a lowered light output of the PSF phosphor with time. The stability is improved by coating the phosphor particles with a thin shell consisting of undoped host material (K2SiF6) only.1. Smet, P.F., A.B. Parmentier, and D. Poelman, Selecting Conversion Phosphors for White Light-Emitting Diodes. Journal of The Electrochemical Society, 2011. 158(6): p. R37.2. Sijbom, H.F., et al., Luminescent Behavior of the K2SiF6:Mn4+Red Phosphor at High Fluxes and at the Microscopic Level. ECS Journal of Solid State Science and Technology, 2015. 5(1): p. R3040." @default.
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- W2808201400 date "2016-01-01" @default.
- W2808201400 modified "2023-09-23" @default.
- W2808201400 title "Structural analysis of phosphor degradation in K2SiF6:Mn4+" @default.
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