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Psoriasis is a noncontagious, long‐lasting skin infection that affects many people around the world. Numerous therapeutic artificial treatments are available for the treatment of psoriasis, such as photodynamic therapy using broadband ultraviolet (UV) lamps, which have harmful effects on human skin. Similarly, the natural healing systems such as sunlight have a higher risk of sunburn and can cause dangerous forms of skin cancer. Significant light emission of a specific wavelength (in the UV range), and phosphor‐based devices demonstrate the effectiveness of treating psoriasis without damaging the skin. Gd3+‐doped calcium magnesium silicate [Ca2MgSi2O7:Gd3+,(CMS:Gd3+)] phosphor is one of the ideal phosphors that emit specific narrow UV wavelengths for curing psoriasis and is in great demand in the field of dermatology. Photoluminescence analysis at room temperature (~25°C) shows that the synthesized CMS:Gd3+ phosphor emits narrowband UV‐B light with a peak intensity at 314 nm. Comparative studies of the standard action spectrum of psoriasis with the emission spectrum of the CMS:Gd3+ phosphor show that the synthesized phosphor was the most suitable material for treating a variety of diseases, including psoriasis, vitiligo, type‐1 diabetes, dental disease, sleep and mood disorders, and other skin diseases. [ABSTRACT FROM AUTHOR]

The photoluminescent (PL) properties of Sm3+-doped strontium hexaborate (SrB6O10) phosphors are significantly influenced by their crystallinity, phase and dopant concentration. To obtain a high brightness orange-red emitting SrB6O10:Sm3+ phosphor, a controlled and modified soluble-salt reaction method in the presence of a chelating agent (citric acid, C6H8O7) was used at ∼700 °C for about half an hour under an air atmosphere, which is otherwise only possible at very high (>1500 °C) sintering temperatures. The PL spectrum of the SrB6O10:Sm3+ phosphor produced strong and intense PL emission peaks centered at 560 nm (4G5/2 → 6H5/2), 596 nm (4G5/2 → 6H7/2), and 640 nm (4G5/2 → 6H9/2) under excitation of 400 nm (6H5/2→ 6H7/2). This is one of the very few reports that depicts the formation of more shallow traps in the lattice and the concentration quenching phenomenon was attributed to the non-radiative transfer of energy among Sm3+ ions via dipole–dipole interactions in the trap states. The optimized phosphor has noticeable reddish-orange Commission International de I'Eclairage color coordinates of (0.459, 0.337). The PL decay kinetics of the synthesized phosphor showed a biexponential decaying characteristic with an overall decay time of milliseconds. The presence of borate ions benefitted the thermal stability of the SrB6O10:Sm3+ phosphor as well. X-ray diffraction studies confirmed the phase purity, while scanning electron microscopy revealed the morphology to be an agglomerated rod-like structure. The PL intensity increased with increasing Sm3+ concentration and reached the optimum at 0.1 mol%. The obtained results clearly indicate that the SrB6O10:Sm3+ phosphor is a viable material for providing a red component for white-light emitting diodes (w-LEDs). [ABSTRACT FROM AUTHOR]

Psoriasis is a noncontagious, long-lasting skin infection that affects many people around the world. Numerous therapeutic artificial treatments are available for the treatment of psoriasis, such as photodynamic therapy using broadband ultraviolet (UV) lamps, which have harmful effects on human skin. Similarly, the natural healing systems such as sunlight have a higher risk of sunburn and can cause dangerous forms of skin cancer. Significant light emission of a specific wavelength (in the UV range), and phosphor-based devices demonstrate the effectiveness of treating psoriasis without damaging the skin. Gd 3+ -doped calcium magnesium silicate [Ca 2 MgSi 2 O 7 :Gd 3+ ,(CMS:Gd 3+ )] phosphor is one of the ideal phosphors that emit specific narrow UV wavelengths for curing psoriasis and is in great demand in the field of dermatology. Photoluminescence analysis at room temperature (~25°C) shows that the synthesized CMS:Gd 3+ phosphor emits narrowband UV-B light with a peak intensity at 314 nm. Comparative studies of the standard action spectrum of psoriasis with the emission spectrum of the CMS:Gd 3+ phosphor show that the synthesized phosphor was the most suitable material for treating a variety of diseases, including psoriasis, vitiligo, type-1 diabetes, dental disease, sleep and mood disorders, and other skin diseases., (© 2023 John Wiley & Sons Ltd.)