Towards efficient solid-state photoluminescence based on carbon-nanodots and starch composites

Abstract

Towards efficient solid-state photoluminescence based on carbon-nanodots and starch composites Sun, M.; Qu, S.; Hao, Z.; Ji, W.; Jing, P.; Zhang, H.; Zhang, L.; Zhao, J.; Shen, D. Published in: Nanoscale DOI:10.1039/c4nr04034aLink to publication Citation for published version (APA):Sun, M., Qu, S., Hao, Z., Ji, W., Jing, P., Zhang, H., ... Shen, D. (2014). Towards efficient solid-state photoluminescence based on carbon-nanodots and starch composites. Nanoscale, 6(21), 13076-13081. DOI: 10.1039/c4nr04034a General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. A new type of environmentally friendly phosphor based on carbon nanodots (CDs) has been developed through the dispersion of CDs by integrating the CDs with starch particles. The starch particles contain large numbers of hydroxyl groups around the surfaces, which can effectively absorb the CDs, whose surfaces are functionalized by lots of carboxyl and amide groups, through hydrogen bonding. Effective dispersion of CDs on the surfaces of starch particles can suppress the non-radiative decay processes and photoluminescence (PL) quenching induced by aggregation of CDs. The starch matrix neither competes for absorbing excitation light nor absorbs the emissions of CDs, which leads to efficient PL emitting. As a result, the starch/CD phosphors with a quantum yield of ∼50% were obtained. The starch/CD phosphors show great potential in phosphor-based light emitting diodes, temperature sensors, and patterning.

Transparent sunlight conversion film based on carboxymethyl cellulose and carbon dots

“…It is notes that the pure CMC film has almost no absorption above 240 nm; while the CMC/CDs film has continuous broad absorption in the ultraviolet region ranging from 240 to 420 nm, especially a strong broad peak located in 360 nm, similar to the absorption spectrum of CDs in water, which indicates the good combination of both the CDs and CMC in the composites. From the comparison, it is concluded that the optical properties of CDs have no obviously changes after embedded in the CMC matrix, which means that the CMC matrix neither competes for absorbing excitation light nor absorbs the emissions of CDs (Sun et al, 2014), and explains that the CMC can act as a suitable matrix for sunlight conversion.…”

A Self‐Quenching‐Resistant Carbon‐Dot Powder with Tunable Solid‐State Fluorescence and Construction of Dual‐Fluorescence Morphologies for White Light‐Emission

“…[ 1,7 ] Though few reports have just mentioned solid-state fl uorescence (SSF) of CD powder, [ 8 ] they provide no detailed information as to why and how CDs can resist self-quenching in the aggregation state, much less the related applications. Furthermore, a common way, i.e., embedding fl uorescent dopants in solid matrices such as starch, [ 9 ] silica xerogel, [ 10 ] and polymers, [ 11 ] has been carried out to realize SSF of CD-based composites. In this case, however, the fl uorescence is nearly the same as that of CDs aqueous solution, because the matrices act as media like water, where CDs can uniformly disperse; in other words, these have not yet conquered self-quenching resulting from aggregation.…”

Full‐Color Emission Polymer Carbon Dots with Quench‐Resistant Solid‐State Fluorescence

“…To circumvent this drawback, encapsulation methods to immobilize PCDs in solid matrix, such as starch,27, 28 inorganic salt,29 silica gel,30, 31 oligomeric silsesquioxane,32 and polymers33, 34, 35, 36 have been adopted to disperse the PCDs in these solid matrixes to retain the fluorescence. In detail, Qu and co‐workers used inorganic salt (BaSO 4 ) to stabilize the PL properties of PCDs, preventing PCDs from self‐quenching effect in solid state 29.…”