Impact of Intermolecular Distance on Singlet Fission in a Series of TIPS Pentacene Compounds

Wu, Yishi; Liu, Ke; Liu, Huiying; Zhang, Yi; Zhang, Hao‐Li; Yao, Jiannian; Fu, Hongbing

doi:10.1021/jz5017729

Cited by 82 publications

(104 citation statements)

References 21 publications

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“…29 The pump beams and the probe beams originate from the same laser pulse at 800 nm (120 fs, 1 kHz) by using a 9 : 1 beam splitter. Thus, we can calculate the absorbance difference for these two probe beams to obtain the absorption spectra of the excited-state.…”

Section: Methodsmentioning

confidence: 99%

A soluble cryogenic thermometer with high sensitivity based on excited-state configuration transformations

Chen

Wang

et al. 2015

Phys. Chem. Chem. Phys.

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Cryogenic temperature detection plays an irreplaceable role in exploring nature. Developing high sensitivity, accurate, observable and convenient measurements of cryogenic temperature is not only a challenge but also an opportunity for the thermometer field. The small molecule 9-(9,9-dimethyl-9H-fluoren-3yl)-14-phenyl-9,14-dihydrodibenzo[a,c]phenazine (FIPAC) in 2-methyl-tetrahydrofuran (MeTHF) solution is utilized for the detection of cryogenic temperature with a wide range from 138 K to 343 K. This system possesses significantly high sensitivity at low temperature, which reaches as high as 19.4% K(-1) at 138 K. The temperature-dependent ratio of the dual emission intensity can be fitted as a single-exponential curve as a function of temperature. This single-exponential curve can be explained by the mechanism that the dual emission feature of FIPAC results from the excited-state configuration transformations upon heating or cooling, which is very different from the previously reported mechanisms. Here, our work gives an overall interpretation for this mechanism. Therefore, application of FIPAC as a cryogenic thermometer is experimentally and theoretically feasible.

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Section: Methodsmentioning

confidence: 99%

A soluble cryogenic thermometer with high sensitivity based on excited-state configuration transformations

Chen

Wang

et al. 2015

Phys. Chem. Chem. Phys.

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“…[35][36][37][38][39][40][41][42][43] In this case, a largely unexplored question is the relationship between SF process and SE migration. Several experiments 37,38,40 have observed that the SE delocalization can drive a rapid SF process in well-arranged molecular crystals.…”

Section: Introductionmentioning

confidence: 99%

Effects of Charge Transfer State and Exciton Migration on Singlet Fission Dynamics in Organic Aggregates

Zang

Zhao

et al. 2016

J. Phys. Chem. C

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A time-dependent wavepacket diffusion method is used to investigate the effects of charge transfer (CT) states, singlet exciton and multiexciton migrations on singlet fission (SF) dynamics in organic aggregates. The results reveal that the incorporation of CT states can result in a different SF dynamics from the direct interaction between singlet exciton and multiexciton, and an obvious SF interference is also observed between the direct channel and the indirect channel mediated by CT states. In the case of direct interaction, although the fast population transfer of singlet exciton in monomers, by the increase of exciton-exciton interaction, can accelerate the SF process, the spatial coherence alternatively has a counter-productive effect, and their competition leads to an optimal exciton-exciton interaction at which SF has a maximal rate. This trade-off relationship in SF dynamics is further analysed from different perspectives, specifically in spatial and energy representations, is also confirmed through the indication that static energy disorders can speed up SF process by destructing the coherence.Meanwhile, it is found that the couplings among multiexciton states decrease SF rates by the multiexciton coherence and backward conversion from multiexciton to singlet exciton states.

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“…Recently, the same authors have demonstrated that the control of the structural arrangement in films boosts the field‐effect mobility to remarkable values of 11 cm 2 V −1 s −1 . In addition, this molecule has recently emerged as a paradigm to study singlet fission process in both solution and thin films, owing to its triplet quantum yield formation exceeding values of 100% . Finally, the sharp red emission at around 650 nm and the moderate photoluminescence quantum yields (PLQYs) when dispersed in a thin film with the electron‐transporting host tris(quinoline‐8‐olato)‐aluminum(III) (Alq 3 ) prompted Kafafi and Anthony groups to fabricate the first OLEDs based on trialkylsilylethynyl‐substitute pentacenes .…”

Section: Introductionmentioning

confidence: 99%

Controlling the Chromaticity of Small‐Molecule Light‐Emitting Electrochemical Cells Based on TIPS‐Pentacene

Weber

Adam

Tykwinski

et al. 2015

Adv Funct Materials

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5066 wileyonlinelibrary.com the most intriguing archetypal compounds. For instance, remarkable charge mobilities of up to 4.6 cm 2 V −1 s −1 for its solution-sheared thin fi lms applied in OFETs have been achieved. [ 8 ] Recently, the same authors have demonstrated that the control of the structural arrangement in fi lms boosts the fi eld-effect mobility to remarkable values of 11 cm 2 V −1 s −1 . [ 9 ] In addition, this molecule has recently emerged as a paradigm to study singlet fi ssion process in both solution and thin fi lms, owing to its triplet quantum yield formation exceeding values of 100%. [ 5,6,[10][11][12][13] Finally, the sharp red emission at around 650 nm and the moderate photoluminescence quantum yields (PLQYs) when dispersed in a thin fi lm with the electrontransporting host tris(quinoline-8-olato)-aluminum(III) (Alq 3 ) prompted Kafafi and Anthony groups to fabricate the fi rst OLEDs based on trialkylsilylethynyl-substitute pentacenes. [ 14,15 ] As the most remarkable result, the authors demonstrated that through a proper design of the molecular structure a near quantitative internal quantum effi ciency based on the PLQYs of the active layer is realized. [ 16 ] Encouraged by this excellent result, we decided to probe the performance of the archetypal TIPS-pentacene as an emitter in small molecule light-emitting electrochemical cells (SM-LECs).LECs have emerged as an interesting alternative to OLEDs due to the single-layer device architecture based on air-stable electrodes, the high power effi ciencies at very low operation voltages, and the low-cost manufacturing process on any 3D-shaped substrate. [17][18][19][20][21][22] These assets are possible due to the unique mechanism as the active layer comprises a blend of mobile ions and mostly one electroactive compound. [23][24][25][26][27] Up to date, the most representative materials for LECs have been mixtures of a light-emitting polymer, an ion conducting polymer, and an inorganic salt, as well as mixtures of ionic transition-metal complexes (iTMCs) and ionic liquids. [19][20][21] However, Edman and co-workers have recently demonstrated that the LEC concept can be easily expanded to small molecule (SM) materials. [ 28 ] This result represents a landmark toward future breakthroughs in the fi eld, especially if we take into account the very recent achievements in SM-based OLEDs that are considered as the new momentum heading into the third generation of this technology, [29][30][31][32][33] as well as SMs are considered as the third generation of materials for LECs, which is now in its early infancy. [ 28,34 ] Controlling the Chromaticity of Small-Molecule LightEmitting Electrochemical Cells Based on TIPS-Pentacene

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Impact of Intermolecular Distance on Singlet Fission in a Series of TIPS Pentacene Compounds

Cited by 82 publications

References 21 publications

A soluble cryogenic thermometer with high sensitivity based on excited-state configuration transformations

A soluble cryogenic thermometer with high sensitivity based on excited-state configuration transformations

Effects of Charge Transfer State and Exciton Migration on Singlet Fission Dynamics in Organic Aggregates

Controlling the Chromaticity of Small‐Molecule Light‐Emitting Electrochemical Cells Based on TIPS‐Pentacene

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