Photochemical upconversion of near-infrared light from below the silicon bandgap

Gholizadeh, Elham M.; Prasad, Shyamal K. K.; Teh, Zhi Li; Ishwara, Thilini; Norman, Sarah; Petty, Anthony J.; Cole, Jared H.; Cheong, Soshan; Tilley, Richard D.; Anthony, John E.; Huang, Shujuan; Schmidt, Timothy W.

doi:10.1038/s41566-020-0664-3

Cited by 110 publications

(137 citation statements)

References 40 publications

Supporting

Mentioning

132

Contrasting

Order By: Relevance

“…16). 37 The aerated solution of PbS/V79 showed delayed UC emission at 700 nm (DE UC = 0.68 eV) upon 1140 nm laser excitation. No UC emission in the absence of oxygen indicated singlet oxygen mediated upconversion mechanism (Fig.…”

Section: Chem Soc Rev Tutorial Reviewmentioning

confidence: 96%

“…However, the PbS-1 O 2 -V79 solution showed very low UC quantum yield due to the difficulty of harvesting the energy from PbS NC. 37 To counter this problem, they incorporated an energy trapping agent, 6,11-bis(triisopropylsilylethynyl)tetracene-2-carboxylic acid (TTCA) on the PbS NC surface to improve the harvesting of triplet energy from PbS NC (Fig. 16c).…”

Section: Chem Soc Rev Tutorial Reviewmentioning

confidence: 99%

See 1 more Smart Citation

Triplet–triplet annihilation based near infrared to visible molecular photon upconversion

2020

View full text Add to dashboard Cite

show abstract

Section: Chem Soc Rev Tutorial Reviewmentioning

confidence: 96%

Section: Chem Soc Rev Tutorial Reviewmentioning

confidence: 99%

Triplet–triplet annihilation based near infrared to visible molecular photon upconversion

2020

View full text Add to dashboard Cite

show abstract

“…Triplet–triplet annihilation‐based photon upconversion (TTA‐UC) has the potential to efficiently convert lower‐energy photons into higher‐energy photons at a weak excitation intensity [1–19] . TTA‐UC occurs in multi‐chromophore systems wherein the excited triplet energy of a donor (sensitizer) is transferred to an acceptor (emitter), and sensitized acceptor triplets annihilate to show an upconverted emission (Figure 1 a).…”

Section: Figurementioning

confidence: 99%

“…Highly efficient TTA‐UC from visible/near‐infrared to visible light has been achieved through the great efforts of many groups [1–19] . On the other hand, the TTA‐UC efficiency ( η UC ) from visible light (vis, λ >400 nm) to ultraviolet light (UV, λ <400 nm) at solar irradiance has been low [20–30] .…”

Section: Figurementioning

confidence: 99%

Discovery of Key TIPS‐Naphthalene for Efficient Visible‐to‐UV Photon Upconversion under Sunlight and Room Light**

et al. 2020

View full text Add to dashboard Cite

While many studies have been done on triplet–triplet annihilation‐based photon upconversion (TTA‐UC) to produce visible light with high efficiency, the efficient TTA‐UC from visible to UV light, despite its importance for a variety of solar and indoor applications, remains a challenging task. Here, we report the highest visible‐to‐UV TTA‐UC efficiency of 20.5 % based on the discovery of an excellent UV emitter, 1,4‐bis((triisopropylsilyl)ethynyl)naphthalene (TIPS‐Nph). TIPS‐Nph is an acceptor with desirable features of high fluorescence quantum yield and high singlet generation efficiency by TTA. TIPS‐Nph has a low enough triplet energy level to be sensitized by Ir(C6)2(acac), a superior donor that does not quench UV emission. The combination of TIPS‐Nph and Ir(C6)2(acac) realizes the efficient UV light production even with weak light sources such as an AM 1.5 solar simulator and room LEDs.

show abstract

“…Triplet-triplet annihilation-based photon upconversion (TTA-UC) has attracted much interest because of its potential to efficiently convert lower-energy photons to higher-energy photons at a weak excitation intensity. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] TTA-UC occurs in multi-chromophore systems wherein the excited triplet energy of a donor (sensitizer) is transferred to an acceptor (emitter), and sensitized acceptor triplets annihilate to show an upconverted emission (Figure 1a).…”

mentioning

confidence: 99%

TIPS-Naphthalene for Efficient Visible-to-UV Photon Upconversion under Sunlight and Room Light

Harada¹,

Sasaki²,

Hosoyamada³

et al. 2020

Preprint

View full text Add to dashboard Cite

Until now, the efficiency of triplet-triplet annihilation-based photon upconversion (TTA-UC) from visible to ultraviolet (UV) light has been limited to ca. 10% due to the absence of high-performance acceptors (emitters). Here, we present the first example of visible-to-UV TTA-UC internal efficiency ηUC beyond 20% by developing a novel UV emitter, 1,4-bis((triisopropylsilyl)ethynyl)naphthalene (TIPS-Nph), and sensitizing its triplet by a donor Ir(C6)2(acac) with strong visible absorption and weak UV absorption. Under optimized conditions, 97% of the excitation light is absorbed, the threshold excitation intensity (Ith = 1.1 mW cm−2) is lower than the solar irradiance (1.4 mW cm−2 for 445 ± 5 nm), and significantly, the highest external UC efficiency ηUC,ext of 17.4% for vis-to-UV TTA-UC is achieved. Upconverted UV emission can also be obtained with weak light sources such as an AM 1.5 solar simulator and room LEDs, paving the way for a variety of solar and indoor applications.

show abstract

Photochemical upconversion of near-infrared light from below the silicon bandgap

Cited by 110 publications

References 40 publications

Triplet–triplet annihilation based near infrared to visible molecular photon upconversion

Triplet–triplet annihilation based near infrared to visible molecular photon upconversion

Discovery of Key TIPS‐Naphthalene for Efficient Visible‐to‐UV Photon Upconversion under Sunlight and Room Light**

TIPS-Naphthalene for Efficient Visible-to-UV Photon Upconversion under Sunlight and Room Light

Contact Info

Product

Resources

About