COLOR TUNABLE PERSISTENT LUMINESCENCE IN M2MgSi2O7:Eu2+,Dy3+ (M=Ca,Sr,Ba) PHOSPHOR WITH CONTROLLED..

One pot hydrothermal approach was used to make colour tunable, very intense, and long-lasting M2MgSi2O7 (M=Ca, Sr, Ba) phosphors. The phosphor particles were well controlled by the mixture's solution pH, which considerably modified the luminescence intensities. In comparison to the traditional solid state method, the hydrothermal method produced narrow particle size distribution, homogenous, and agglomeration-free particles. The hypothesised particle generation mechanism was highlighted in relation to the pH of the initial liquid. Changing the host cations fine-tuned the fluorescence and afterglow colour. The phosphors Sr2MgSi2O7:Eu2+,Dy3+, Ba2MgSi2O7:Eu2+,Dy3+, and Ca2MgSi2O7:Eu2+,Dy3+ showed bluish green, green, and yellowish-green afterglow, respectively. The afterglow length was discovered to be in the order Ca2MgSi2O7 > Ba2MgSi2O7 > Sr2MgSi2O7, and was explored in terms of trap depths in the various hosts. For bright afterglow with longer lasting duration, the optimal Eu2+ activator and Dy3+ trapping centres were calculated. Due to their superior water resistance qualities, these difficult-to-realize yellowish-green afterglow phosphors may have applications.

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