Research progress on surface modifications for phosphors used in light-emitting diodes (LEDs)

Thermal degradation on PL intensity of as-prepared and N 2 -treated Sr 2 Si 5 N 8 :Eu 2+ phosphors with heating (heating from 30 °C to 300 °C) and cooling (from 300 °C to 30 °C). Insets are their photographs phosphor powders excited in a 365 nm-UV box.