Photoconductivity studies of perylene tetracarboxyl-diimides

Popović, Zoran D.; Loutfy, Rafik O.; Hor, Ah‐Mee

doi:10.1139/v85-022

Cited by 75 publications

(33 citation statements)

References 7 publications

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“…Such red-shift phenomena have been reported in other assembled PD systems and have been attributed to the highly ordered molecular organization that allows more efficient p-p stacking and energy transport among the bridging PD moieties. [30][31][32][33][34][35][36] Figure 3 (right) shows the fluorescence spectra of PDBS solution and the assembled aggregates with different morphologies. Similarly, these aggregates show evidently red-shift as compared to PDBS spectrum in dilute solution.…”

Section: Pdbs Assemblies With Unique Propertiesmentioning

confidence: 99%

Hierarchical Assembly of Organic/Inorganic Building Molecules with π–π Interactions

Peng

Huang

et al. 2008

Adv Funct Materials

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Hierarchical assemblies of perylenetetracarboxylic diimide bridged silsesquioxane (PDBS) with controlled structure at multi‐length scale are studied using both experimental and computational methods. The organization process spans multi‐length scales and includes three continuous steps: 1) stacking of the preprogrammed molecules into small clusters, 2) growing of the small clusters into nanoscale building blocks with various sizes and shapes depending on the experimental conditions, and 3) aggregation of nanoscale building blocks into micro‐ or macro‐scale assemblies. The main factors determining the assembly morphology are the second and third steps, which can be controlled by varying the experimental conditions, such as solution drying rate, solvent composition, and PDBS concentration. Despite the different morphologies, all of these assemblies possess highly ordered lamellar structure. It is found that incorporating perylenetetracarboxylic diimide (PD) moieties into the highly ordered silica network endows the PD components with high thermal and mechanical stability, as well as improved optical and electronic properties.

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Section: Pdbs Assemblies With Unique Propertiesmentioning

confidence: 99%

Hierarchical Assembly of Organic/Inorganic Building Molecules with π–π Interactions

Peng

Huang

et al. 2008

Adv Funct Materials

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“…the effect discussed previously to understand the field modification of the emission spectra from the Alq 3 -doped TPD SL EL cells (section 6.1.3.1, figure 35(c)). Since the field-induced fluorescence quenching efficiency for Alq 3 is ≈30% [196] and for TPD ≈5% [197] at F ∼ = 2×10 6 V cm −1 , the ratio (99) must be multiplied by a factor, 0. the second Mg-adhering recombination zone in the PBP layer, thus increasing the number of metal-quenched excitons responsible for the red emission component, and strong quenching of these excitons by the applied field itself, which in the case of PBPs can be as high as 80-90% for fields ≈2 × 10 6 V cm −1 [213] that is being from two to three times higher than that in Alq 3 [196].…”

Section: 23) In Any Case W E-h Does Not Exceed 20% Of D Confirmimentioning

confidence: 99%

Electroluminescence in organics

Kalinowski

1999

J. Phys. D: Appl. Phys.

231

161

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There is growing interest in organic electroluminescence (EL). A great deal of progress has been made recently in improving the performance of various classes of organic EL devices. Some of these are now adequate for many applications. However, specialists focusing on selected aspects of organic EL devices have often lost contact with the general subject of EL. Therefore, a review covering all aspects of EL mechanisms and their experimental manifestation seemed necessary. This article is concerned with the new EL device physics that can be realized using crystals, or films made of organic materials, as electrically and optically active components, in devices ranging from simple single-component light emitting diodes (LEDs), through double-and multi-layer LEDs to light emitting electrochemical cells (LECs) and organic LED-based light transducers. The investigation of the properties of these devices has provided in turn a very effective method for studying the basic EL phenomena in these materials. Since the subject of the present review has generated a huge amount of literature, and it is impossible to mention here all that has been done, we have attempted to provide an outline of the background of the field of organic EL, and discussed in some detail those aspects most relevant to the EL device physics. Because of the diversity of the types of material and EL structure, there is no single, simple description of EL in organics. Therefore, the initial sections of the article are devoted to a discussion of the types of EL and related phenomena, such as carrier injection and recombination or nature of emitting states. Then, the fundamentals of the fabrication of various types of EL devices are discussed along with the most representative examples. In general, the reader will find in the article a brief historical review of the subject as well as a description of the latest trends in organic EL research covering all the new concepts and most important data which have become available before the time of publication.

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“…Singlet exciton quenching by the applied voltage has been observed in a large number of materials such as crystalline molecular pigments [1][2][3], polymers doped with dye molecules [4][5][6], conjugated polymers [7]. Several processes cause a fluorescence intensity variation under the applied electric field.…”

Section: Introductionmentioning

confidence: 99%

“…Several processes cause a fluorescence intensity variation under the applied electric field. The main of them are the fieldinduced exciton dissociation [1,2,[8][9][10][11] and fluorescence quenching by injected charge carriers [12][13][14][15][16]. The Stark effect may also cause the fluorescence intensity variations by changing the sample absorbance at excitation wavelength or by changing rates of electronic transitions [17,18].…”

Section: Introductionmentioning

confidence: 99%