Colloidal quantum dot hybrids: an emerging class of materials for ambient lighting

Abstract

Electroluminescence light-emitting diodes enabled by hybridising colloidal quantum dots is an emerging technology for large-area and foldable ambient lighting. We summerise state-of-the-art scientific challenges and prospect their future development.

Indoor photovoltaics, The Next Big Trend in solution‐processed solar cells

“…The device working area for an IPV is only a few square centimeters, with incident light intensity as low as 0.1–10 W m −2 mainly in the visible region from diffuse solar radiation in the indoor environment and ambient artificial light sources such as incandescent light bulbs, compact fluorescent lamps, and white light‐emitting diodes (LEDs) 10 . Indoor lighting applications are designed and optimized based on the spectral sensitivity of human eyes, which peaks at 550 nm in a range from 380 to 780 nm 11 . Therefore, IPVs can exploit the advantage of a higher open‐circuit voltage ( V oc ) when shifting to larger bandgaps, while simultaneously benefiting from a high photon yield.…”

“…Colloidal quantum dots are a type of nanoscale semiconductor crystals that exhibit unique optical, electrical properties, including size‐dependent light absorption, excellent stability, high charge mobility, and facile synthesis 11,49‐56 . Till now, PCE of QDSCs has been improved up to 13% 13,49,57‐64 .…”

Indoor application of emerging photovoltaics—progress, challenges and perspectives

“…QDs have been brought to the forefront of the development of high-denition television (HDTV) over the past 2-3 years as a more versatile alternative to organic LEDs with a higher colour gamut. As an immediately related technology, the development of QDPVs can directly benet from QD LEDs as a highly promising PV technology 73,74 that suffer no compromise between high theoretical efficiency, stability and low cost, showing excellent ambient tolerance aer QD surface passivation and band alignment. 75,76 Compared with perovskites, conventional bulk semiconductors and organic semiconductors, QDs possess a low photon energy threshold for multiple exciton generation, which enables QDPVs to go beyond the Shockley-Queisser (SQ) limit.…”

Rare Earth‐Free Luminescent Materials for WLEDs: Recent Progress and Perspectives

“…QDs consist of nanocrystals (NCs) of a semiconducting material with diameters in the range of 2-10 nm, which have adjustable PL properties and important applications in the field of optoelectronics. [20][21][22][23] Compared with commercial luminescent materials containing rare earth elements, rare earth-free QD luminescent materials show considerable advantages in specific properties including luminescence efficiency and color performance, among others. In particular, InP QD materials have been used in relevant applications such as displays due to its characteristics as a nontoxic and efficient luminescent material, [24] and it has significant potential applications in WLEDs.…”