Surface encapsulation of nanophosphors by nanoscale silica (SiO2) coating is an effective strategy to enhance the luminescence property for opto-electronic application. The present work investigates about the synthesis of silica encapsulated LuAG:Pr3+ nanocrystals by surfactant assisted co-precipitation and rapid microwave calcination. The ultrafast microwave heating of silica encapsulated LuAG:Pr at 1050 degrees C for 10 min resulted in the formation of well-crystallized nanocrystals in cubic phase that evidenced by XRD Rietveld analysis. FE-SEM and HR-TEM examinations revealed the formation of similar to 6 nm nanoscale silica film encapsulation on LuAG:Pr nanocrystals. EDS elemental and XPS investigations confirmed the presence of SiO2 layer encapsulation on the surface of nanoparticle. The nanoscale silica encapsulated LuAG:Pr nanocrystals displayed two-fold enhancement in luminescence red emission than uncoated counterpart nanocrystals. The continuous nanoscale silica coating served as an integrating sphere that confides incident photons by means of multiple reflections and improved the light extraction. Temperature dependent photoluminescence analysis of the silica coated LuAG:Pr3+ nanocrystal was also studied. It revealed the original emission intensity was stable up to 425 K and start decreasing to 55% at 520 K, which promoted stable high temperature luminescence behavior. Thermoluminescence investigation was also performed for uncoated and silica-coated LuAG:Pr nanocrystals by irradiated them with high energy gamma-ray (Co-60) source at 200 Gy for 2 min. The trap-depth in terms of activation energy (E) and frequency factor (s) of the gamma ray irradiated nanoparticles was estimated by computerized GCD operation.