Efficiently Enhanced Triplet–Triplet Annihilation Upconversion Boosted by Multibandgaps Photonic Crystals

Abstract

The enhancement of triplet–triplet annihilation upconversion (TTA-UC) processes is of profound significance to address key bottleneck problem associated with the practical applications of TTA-UC. In this work, optimized multibandgaps photonic crystal (PC) structures were introduced to dramatically amplify the upconversion signal. Two effects of PCs were proven to lead the enhancement. First, the reflective mirror function can enhance both the irradiance on the TTA-UC materials and the directional emission of the TTA-UC system; second, the inhibition of the TTA-UC sensitizer’s phosphorescence by matched bandgap of PCs could be beneficial for the triplet–triplet energy transfer process between the triplet sensitizer and the triplet acceptor, resulting in accelerating the final UC emission of the system. The interactions between the TTA-UC system and different PC structures were carefully discussed, and the results are anticipated to provide a new efficient platform for the PC-based TTA-UC.

Directional quantum dot emission by soft-stamping on silicon Mie resonators

“…In solid-state lighting systems, tailored visual appearances can be achieved by controlling the angular distribution of light emission 3,4 . And in photovoltaic systems, control over the directionality of emission can improve the efficiency of luminescent solar concentrators 5,6 and enhance the efficiency of up-and down-conversion schemes [7][8][9][10] .…”

“…3,4 And in photovoltaic systems, control over the directionality of emission can improve the efficiency of luminescent solar concentrators 5,6 and enhance the efficiency of upand down-conversion schemes. [7][8][9][10] Resonant nanostructures can help tailor the emission of dipole-like point emitters by controlling the coupling between the resonant modes and the emitter. The spectrum, polarization, and angular distribution of the emission are then determined by the coherent superposition of the scattered elds of the electric and magnetic multipoles and their coupling to the emitter's dipole moment.…”

FDTD Modeling of Au/Ag Nanoparticles Incorporated Au/Ag Photonic Crystal for Seeking the Maximal Localized Electric Field

“…PhC enhancement includes strong absorption or reflection at specific wavelengths in the far-field and rearrangement of the electric field in the near-field. Typical examples are PhC enhanced light harvesting, [10][11][12] PhC enhanced catalysis, [13,14] PhC enhanced Raman spectroscopy, [15][16][17][18][19] PhC enhanced fluorescence spectroscopy, [17,20,21] PhC enhanced upconversion, [22,23] etc. [24][25][26] More specifically, Wen Xu and Hongwei Song reported that with the guidance of theoretical simulation, the plasmonic effect combined PhC effect enhanced the fluorescence of CsPbCl 3 by ≈150-fold.…”

Nanocrystal-Sensitized Infrared-to-Visible Upconversion in a Microcavity under Subsolar Flux

“…Likely, radiative decay of NCs is inhibited because the NC emission wavelength (λ ∼ 1100 nm) is not supported in the cavity (see reflectance spectra in Figure a). Since radiative decay competes with triplet transfer, the latter is expected to become more efficient . Overall, the generation yield of upconverted photons (Φ UCg ) is increased by 2.2 times.…”

“…Our analysis of the device performance highlights a few opportunities and challenges for solid-state upconversion. First, the infrared absorption could be boosted further by employing optical cavities with higher Q factors, such as a Fabry–Pérot cavity made of two DBRs, photonic crystals, and plasmonic cavities. , Second, photonic designs that not only resonantly enhance the absorption but also significantly improve the fluorescence yield and/or outcoupling would be highly desirable. , The use of cavities, however, inevitably reduces the spectral line width and angular range of absorption. This may be acceptable for sensing or detection applications but would be undesirable for photovoltaics.…”