Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 40, Pages 34184-34192Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b10618
Keywords
greener luminescent solar concentrators; cross-linked carbon nanodots; high loading concentration; concentration-induced quenching
Funding
- Ministry of Science and Technology Taiwan [MOST 104-2112-M-033-003-MY3, 107-2112-M-033-007, 107-2112-M-033-004-M13]
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A luminescent solar concentrator (LSC) is composed of loaded luminophores and a waveguide that can be employed to harvest and concentrate both direct and diffused sunlight for promising applications in solar windows. Thus far, most of efficient LSCs still relied on the heavy-metal-containing colloidal quantum dots (CQDs) dispersed into a polymer matrix with a very low loading (typically <1 wt %). Such low-loading constraint is required to mitigate the concentration induced quenching (CIQ) and maintain high optical quality and film uniformity, but this would strongly reduce the light absorbing efficiency. To address all issues, greener LSCs with high loading concentration were prepared by in situ cross-linking organosilane-functionalized carbon nanodots (Si-CNDs), and their photophysical properties relevant to LSC operation were studied. The PL emission is stable and does not suffer from the severe CIQ effect for cross-linked Si-CNDs even with 25 wt % loadings, thus exhibiting high solid-state quantum yields (QYs) up to 45 +/- 5% after the calibration of the reabsorption losses. Furthermore, such LSCs can still hold high optical quality and film uniformity, leading to low scattering losses and high internal quantum efficiency of similar to 22%. However, the reabsorption losses need to be further addressed to realize large-area LSCs based on earth-abundant, cost-effective CNDs.
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