Surface Plasmon Enhanced Nitrogen‐Doped Graphene Quantum Dot Emission by Single Bismuth Telluride Nanoplates

Abstract

The light–matter interaction between nitrogen‐doped graphene quantum dots (N‐GQDs) and bismuth telluride (Bi2Te3) nanoplates is investigated. A maximum of (2.9 ± 0.3)‐fold emission rate enhancement is observed at room temperature due to the coupling of N‐GQD emission with the breathing mode of surface plasmon of single Bi2Te3 nanoplates. The enhancement varies with different emission wavelengths and nanoplate diameters in accordance with results obtained through the dipole radiation power in the electromagnetic simulations. From experiment, the quantum yield of N‐GQDs is obtained to be almost unity, while Bi2Te3 nanoplates may replace the conventional antenna. Such combination of novel active and plasmonic materials is promising for efficient lighting applications with multiple functionalities, especially tunable plasmonic metamaterial based on topological insulators.

Controlling Spontaneous Emission from Perovskite Nanocrystals with Metal-Emitter-Metal Nanostructures

“…To verify the role of PS spacer layer in Purcell effect, we present in Figure S5 (Supplementary Information) the time-resolved PL measurements of 50-nm thick CsPbBr3 NC on gold film without PS spacer layer. We found that the fast decay component in this situation is very close to the instrument response function (IRF) of about 0.3 ns [23]. Coupled with the intensity decrease in Figure S1, it is seen that the fast decay rate is not attributed to Purcell effect, but to non-radiative loss instead.…”

Controlling Spontaneous Emission from Perovskite Nanocrystals with Metal-Emitter-Metal Nanostructures

“…To verity the role of PS spacer layer in Purcell effect, we present in Figure S2 (Supplementary Information) the time-resolved PL measurements of 50-nm thick CsPbBr3 NC on gold film without PS spacer layer. We found that the fast decay component in this situation is very close to the instrument response function (IRF) of about 0.3 ns [22]. Coupled with the intensity decrease in Figure S1, it can be seen that the fast decay rate is not attributed to Purcell effect, but to non-radiative loss instead.…”

“…In the FEM [22,27], the emission rate enhancement is calculated as the dipole power ratio between that within the plasmonic layer structures and that in the perovskite film only. The calculated |E|-field mappings at resonances for ME and MEM structures with CsPbBr3 NC film are shown in Figure 4(c) and Figure 4(d), respectively.…”

Light–Matter Interaction of Single Quantum Emitters with Dielectric Nanostructures

“…Moreover, plasmonic nanostructures have been also reported for controlling the emission rate [48][49][50][51]. Compared to dielectric material with small radiative loss, the plasmonic material may give much larger spontaneous emission enhancement but with large radiative loss of plasmons [56][57][58][59].…”