Abstract
Carbon dots (CDs), as the most important type of carbon materials, have been widely used in many fields because of their unique fluorescence characteristics and excellent properties of biocompatibility. In previous studies, the fluorescence of CDs was mainly concentrated in the blue and green, whereas the red fluorescence was relatively less. Herein, we prepared efficient red-emitting CDs from 1,4-diaminonaphthalene using solvothermal methods. We discussed the effects of different solvothermal solvents on CDs. The results show that CDs prepared with octane and acetone as reaction media have the best fluorescence properties. The CDs dispersed in different organic solvents exhibited tunable emission across a wide spectrum from 427 nm to 679 nm. We further demonstrated the application of red light-emitting diode (LED) optoelectronics and fluorescence detection of Fe3+ in aqueous solution.
Highlights
IntroductionCompared with traditional semiconductor quantum dots, carbon dots (CDs) have good biocompatibility, high photoluminescence quantum yield, low production cost and an environment-friendly synthesis method [2,3,4,5]
Since their first discovery in 2004, carbon dots (CDs), as a new breakthrough in the field of carbon nanomaterials [1], have attracted extensive attention in the past decade.Compared with traditional semiconductor quantum dots, CDs have good biocompatibility, high photoluminescence quantum yield, low production cost and an environment-friendly synthesis method [2,3,4,5]
The development of photoluminescence in the whole visible region is very important for the practical application of CDs [16,17,18,19,20,21]; attempts to produce CDs with tunable emission have rarely been reported [22,23]
Summary
Compared with traditional semiconductor quantum dots, CDs have good biocompatibility, high photoluminescence quantum yield, low production cost and an environment-friendly synthesis method [2,3,4,5]. These characteristics provide CDs with great application potential in the fields of sensors, display lighting equipment and biology [6,7,8,9]. Ding et al [8] prepared a batch of CDs by hydrothermal synthesis with p-phenylenediamine and urea as raw materials They separated CDs by silica gel column chromatography and obtained eight groups of CDs, with luminescence ranging from blue to red (440 nm–625 nm)
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