Candlelight LEDs fabricated by using composite silica photonic crystals

In this study, we demonstrated a reliable technique combination a little phosphor and composite silica photonic crystals (c-SPhCs) for developing the candlelight light-emitting diodes (LEDs). We used a UV adhesive curing method for improving the adhesion properties of SPhCs. The warm-white LEDs with c-SPhCs exhibit a correlated color temperature of 2089 K, a color-rendering index of 80, and a luminous flux of 34.5 Im (5.4 times that of a candle). The LEDs were subjected to a reliability analysis (RA) test, applying a high temperature and high relative humidity (85 [degrees]C/85 RH) during operation current at 120 mA. During a RA test of 3300 h, no visible degradation in optical performance has been observed. We implemented a reliable and inexpensive technique for producing the residential lighting source.