Ag@SiO2-embedded InGaN/GaN nanorod array white light-emitting diode with perovskite nanocrystal films

Highlights: • For the first time, we reported an Ag@SiO₂-embedded nanorod structure in perovskite white LED. • Ag@SiO₂-embedded nanorod structure presented localizes surface plasmon coupling effect. • Stability of perovskite nanocrystals was improved with polydimethylsiloxane. • Obtained white LED exhibited high photoluminescence intensity and high color rendering index. -- Abstract: White light-emitting diodes (LEDs) are great candidates for general lighting. Phosphors have commonly been used for the color conversion layers of white LEDs; however, they backscatter more than half of the down-converted light, which is lost within the device, thus degrading the overall performance. In this study, we propose and demonstrate white LEDs with improved efficiency enabled by the intimate integration of Ag@SiO₂-supported blue InGaN/GaN nanorod LEDs together with green- and red-emitting perovskite nanocrystal (PNC) films as color conversion layers. The photoluminescence (PL) intensity of the blue LEDs (BLEDs) was significantly enhanced owing to the localized surface plasmon (LSP) effect of Ag@SiO₂ nanoparticles. In addition, the perovskite PL intensity was improved by the high-power BLED backlight. The resulting PL intensity of the Ag@SiO₂ nanoparticle-embedded nanorod white LED was 62% greater than that of a planar white LED.