A photon-recycling incandescent lighting device

Abstract

Energy-efficient, healthy lighting is vital for human beings. Incandescent lighting provides high-fidelity color rendering and ergonomic visual comfort yet is phased out owing to low luminous efficacy (15 lumens per watt) and poor lifetime (2000 hours). Here, we propose and experimentally realize a photon-recycling incandescent lighting device (PRILD) with a luminous efficacy of 173.6 lumens per watt (efficiency of 25.4%) at a power density of 277 watts per square centimeter, a color rendering index (CRI) of 96, and a LT70-rated lifetime of >60,000 hours. The PRILD uses a machine learning–designed 637-nm-thick visible-transparent infrared-reflective filter and a Janus carbon nanotube/hexagonal boron nitride filament to recycle 92% of the infrared radiation. The PRILD has higher luminous efficacy, CRI, and lifetime compared with solid-state lighting and thus is promising for high–power density lighting.

Polymer‐Surface‐Mediated Mechanochemical Reaction for Rapid and Scalable Manufacture of Perovskite QD Phosphors

“…Solid-state lighting has become prevalent in almost every aspect of daily life due to their low energy consumption, high efficiency, and long lifetime compared to traditional incandescent and fluorescent light sources. [1][2][3] The mainstream solid-state lightings are based on down-conversion phosphor-converted white lightemitting-diode (WLED) technology by coating phosphors on LED chips. [4,5] Although significant advances have been made in these synthesized perovskite emitters through solid-state methods, such as ball milling and hand grinding.…”

“…Solid‐state lighting has become prevalent in almost every aspect of daily life due to their low energy consumption, high efficiency, and long lifetime compared to traditional incandescent and fluorescent light sources. [ 1–3 ] The mainstream solid‐state lightings are based on down‐conversion phosphor‐converted white light‐emitting‐diode (WLED) technology by coating phosphors on LED chips. [ 4,5 ] Although significant advances have been made in these WLEDs, most down‐conversion phosphors (including rare earth and transition metal doped/activated phosphors, [ 6,7 ] semiconductor quantum dots [QDs], [ 8 ] organic dyes [ 9 ] ) developed to date suffer from at least one of the following challenges: nonideal photoluminescence (PL) quantum yield (PLQY), high cost, and complex synthesis.…”