Diels-Alder adducts of C-60 and resin acid derivatives: Synthesis, electrochemical and fluorescence properties

Recent developments in fundamental aspects and applications of the thermally activated delayed fluorescence (TADF) displayed by fullerenes are presented. It is shown that from the analysis of steady-state data, time-resolved data, or a combination of both, it is possible to determine several important photophysical parameters. Outstanding temperature and oxygen sensors based on the TADF effect exhibited by fullerene C 70 are also briefly discussed.

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“…C 60 (13) and some C 60 derivatives (14,15), as well as one C 70 derivative (16), also exhibit TADF, but weaker than that of C 70 .…”

Section: Thermally Activated Delayed Fluorescence: Basic Aspectsmentioning

confidence: 99%

Recent Developments in the Thermally Activated Delayed Fluorescence of Fullerenes

Baleizão¹,

Berberan‐Santos²

2008

ECS Trans.

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“…[2,4] C 70 derivatives, [2,5] fullerene C 60 [6] and some C 60 derivatives [7,8] also exhibit DF, but it is in all cases weaker than in C 70 . Recently, and owing to its special DF properties, C 70 was used as a sensitive probe for both temperature [9,10] and molecular oxygen.…”

Section: Introductionmentioning

confidence: 98%

External Heavy‐Atom Effect on the Prompt and Delayed Fluorescence of [70]Fullerenes

Baleizão¹,

Berberan‐Santos²

2010

ChemPhysChem

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The influence of the external heavy-atom effect (HAE) on the fluorescence properties of C(70) and a C(70) methano monoadduct is determined. For this purpose the photophysics of these [70]fullerenes is studied in polystyrene (PS) and in a related heavy-atom polymer, poly(4-bromostyrene) (PBS). In the absence of HAE (PS matrix) both fullerenes display a strong thermally activated delayed fluorescence (DF) that is more pronounced in the case of C(70). In the presence of HAE (PBS matrix) both prompt (PF) and DF intensities decrease significantly, the same happening to the delayed fluorescence lifetimes. The relative fluorescence intensities (DF intensity/PF intensity) for each fullerene are on the other hand surprisingly similar to the respective ones in PS for the full experimental temperature range. The HAE is responsible for a significant increase of the S(1)→T(1) and S(1)←T(1) intersystem crossing (ISC) rates, and of the T(1)→S(0) radiative rate. In particular, the HAE on a S(1)←T(1) ISC rate is reported here for the first time. The overall substantial insensitivity of relative fluorescence intensities to HAE is explained by a compensation effect: As the S(1)→T(1) and S(1)←T(1) ISC rates on the one hand, and the T(1)→S(0) radiative rate on the other hand work in opposition with respect to DF, a near cancellation of effects occurs.

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“…3 C 60 ͑Ref. 14͒ and some C 60 derivatives, [15][16][17] as well as one C 70 derivative, 18 also exhibit TADF, but to a lesser degree than C 70 .…”

Section: Introductionmentioning

confidence: 99%

Thermally activated delayed fluorescence as a cycling process between excited singlet and triplet states: Application to the fullerenes

Baleizão¹,

Berberan‐Santos²

2007

The Journal of Chemical Physics

113

152

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In efficient thermally activated delayed fluorescence (TADF) the excited chromophore alternates randomly between the singlet and triplet manifolds a large number of times before emission occurs. In this work, the average number of cycles n is obtained and is shown to have a simple experimental meaning: n+1 is the intensification factor of the prompt fluorescence intensity, owing to the occurrence of TADF. A new method of data analysis for the determination of the quantum yield of triplet formation, combining steady-state and time-resolved data in a single plot, is also presented. Application of the theoretical results to the TADF of [70]fullerenes shows a general good agreement between different methods of fluorescence analysis and allows the determination of several photophysical parameters.

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Diels-Alder adducts of C-60 and resin acid derivatives: Synthesis, electrochemical and fluorescence properties

Cited by 23 publications

References 23 publications

Recent Developments in the Thermally Activated Delayed Fluorescence of Fullerenes

Recent Developments in the Thermally Activated Delayed Fluorescence of Fullerenes

External Heavy‐Atom Effect on the Prompt and Delayed Fluorescence of [70]Fullerenes

Thermally activated delayed fluorescence as a cycling process between excited singlet and triplet states: Application to the fullerenes

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