Highly solid-luminescent graphitic C₃N₄ nanotubes for white light-emitting diodes

Abstract

Graphitic C 3 N 4 (g-C 3 N 4 ) has seldom been used for white light-emitting diode (LED) phosphors due to its low solid-state fluorescence quantum yield. Here, we report a facile thermal condensation path for the synthesis of g-C 3 N 4 nanotubes stuffed with quantum dots. The g-C 3 N 4 nanotubes have a high fluorescence quantum yield of 30.92% in the solid state. Nitrogen-rich and graphitic carbon-free features are responsible for the enhanced quantum efficiency. The photoluminescence quantum yield can be controlled and improved by the reaction temperature. We finally demonstrate white light emission by coating the highly solid-luminescent g-C 3 N 4 nanotubes as phosphors onto a 370 nm ultraviolet LED.

Harnessing the Potential of Graphitic Carbon Nitride for Optoelectronic Applications

“…The routes to g-CN have been examined in many reviews such as those by Volokh et al, [5] Zhao et al, [6] Ghosh and Pal, [12] Ong et al, [10] Kessler et al, [23] Xu and Shalom, [26] Bian et al, [27] and Barrio et al [31] The common precursors and methods are summarized in Figure 3 and Table 1 but are not described in detail to avoid a lengthy discussion. In general, bulk CN is synthesized by the polycondensation of nitrogen-rich precursors such as melamine, [32][33][34][35][36][37][38][39] urea, [40][41][42][43][44] cyanamide, [45] dicyandiamide, [46][47][48][49][50][51][52] and benzoguanamine. [53][54][55][56] Direct thermal polycondensation (calcination) is the most popular of the synthetic methods because of its simplicity and cost efficiency.…”

“…[ 31 ] The common precursors and methods are summarized in Figure and Table 1 but are not described in detail to avoid a lengthy discussion. In general, bulk CN is synthesized by the polycondensation of nitrogen‐rich precursors such as melamine, [ 32–39 ] urea, [ 40–44 ] cyanamide, [ 45 ] dicyandiamide, [ 46–52 ] and benzoguanamine. [ 53–56 ] Direct thermal polycondensation (calcination) is the most popular of the synthetic methods because of its simplicity and cost efficiency.…”

SiO2@LaOF:Eu3+ in white light emitting diodes optic efficiency enhancement

“…To create varied composite structures, a huge proportion of hard and soft layouts are utilized. Because of its tunable sizes, silica is a common template being used for core-shell structured components [1]- [3]. If nanomaterials are coated as covers of silicate cores, a spherical morphology core-shell phosphor is formed.…”

Vitrimeric shape memory polymer-based fingertips for adaptive grasping

“…The issue lies in cooling the material, which is necessary to fix a newly programmed shape. Even with the integration of a cooling system (Zhang et al, 2019), it still takes several seconds to go through the shaping process. Furthermore, shape memory polymers suffer from low force generation.…”