Broadband visible luminescence in tin fluorophosphate glasses with ultra-low glass transition temperature

Abstract

White light is generated by appropriately altering the SnO/SnF2 molar ratios in the SnF2–SnO–P2O5 glass without active ions.

Continuously tunable broadband emission of Mn2+‐doped low‐melting point Sn–F–P–O glasses for warm white light‐emitting diodes

“…The linear CTE was determined to be 21.9 ppm/°C, which is close to those reported in the literature . Meanwhile, the Tg value obtained for the TFP glass from CTE measurement is ~122°C and agrees with that derived from differential scanning calorimeter (DSC) analysis in our previous research . Although a small amount of MnO is introduced into the glass, it does not change the Tg of these glasses (Figure B).…”

“…16 Meanwhile, the Tg value obtained for the TFP glass from CTE measurement is~122°C and agrees with that derived from differential scanning calorimeter (DSC) analysis in our previous research. 12 Although a small amount of MnO is introduced into the glass, it does not change the Tg of these glasses ( Figure 1B). More notably, the CTE values are the same as the CTE of metals such as aluminum and copper, and the Tg values are ultralow, which indicates that TFP glass is a superior low-temperature sealing material.…”

“…A broad emission band covers the entire visible light band from 390 to 720 nm under 335‐nm excitation. The PL spectrum of this sample is deconvoluted by the Gaussian function to obtain two emission bands, a longer‐wavelength band around 520 nm which belongs to the T 1 –S 0 transition of Sn 2+ , and a shorter‐wavelength band around 432 nm which can be mainly assigned to the S 1 –S 0 transition . However, it still has weak emission intensity in the red region (600‐720 nm).…”

“…The ultraviolet absorption edge of the TFP glass is around 330 nm, which originates from the Sn 2+ species. 12,20,21 The inset shows several peaks located around 347 and 406 nm corresponding to the transition of Mn 2+ from ground state 6 A 1 (S) to the excited state 4 E(G)/ 4 T 2 (D) and 4 A 1 (G), 22 respectively. Figure 4A shows PL and PLE spectra of TFP glass.…”

“…successfully prepared a PiG inorganic glass‐ceramic phosphors by directly co‐sintering the mixture of Sn–F–P–O‐based glass components, Ce 3+ :Y 3 Al 5 O 12 yellow phosphors, and Eu 2+ :CaAlSiN 3 red phosphors which can yield bright and warm white light. In a recent study, we reported that TFP glass exhibited broadband visible luminescence at room temperature, indicating that rare‐earth‐free TFP glass could be a promising white‐emitting phosphor for w‐LEDs. However, these glasses emitting cool white light are not suitable for practical applications.…”