Optical Properties of Perylene Thin Films on Cu(110)

Abstract

We present a detailed, in situ study of photoluminescence of ultrathin perylene films on a Cu(110) surface. Temperature-dependent measurement has been correlated to the surface phase transition process. Different components of the fluorescence emission have been assigned to excimer, defect states, and monomer excitons. Most importantly, a coverage-dependent measurement has allowed us to identify that only emission from the first layer of the perylene is quenched by the metal substrate.

Contact-free probing of interfacial charging and Debye-like charge screening in SiO$_2$/PDI8-CN$_2$ systems by optical second harmonic generation

“…Even if no specific references are available to elucidate the nature of states contributing to PL emission in PDI8-CN 2 , it is worth citing a recent in-situ PL analysis performed on molecular films of perylene cores. 49 In this work, authors evidenced the different spectral contributions originating from excimers and from defects states at room temperature, with the former contributing to a PL peak significantly red-shifted (∆E ≈ 540 meV) with respect to the 0-0 monomer transition. 49,51 These results are very close to the ones here reported for PDI8-CN 2 , whose PL also can be decomposed as a superposition of two contributes, one approximately peaked at E a =1.76 eV (red dotted curve in Fig.…”

“…49 In this work, authors evidenced the different spectral contributions originating from excimers and from defects states at room temperature, with the former contributing to a PL peak significantly red-shifted (∆E ≈ 540 meV) with respect to the 0-0 monomer transition. 49,51 These results are very close to the ones here reported for PDI8-CN 2 , whose PL also can be decomposed as a superposition of two contributes, one approximately peaked at E a =1.76 eV (red dotted curve in Fig. 2) and another at about E b =1.90 eV (blue dotted curve in Fig.…”

“…It is to be noted that the energy distance between E a and the first absorption transition (E 1 ) is |E 1 − E a | ≈ 520 meV, almost equal to the result reported by Chen and Richardson. 49 It is also to be underlined that the second emission band occurs at photon energies very close to the onset of optical absorption E 0 evidenced by the PLE spectra. On these basis, the PL components peaked at energies E a and E b can be reasonably assigned to excimer emission and below-bandgap defective states, similarly to Ref.…”

Carbonic Anhydrase Immobilized on Encapsulated Magnetic Nanoparticles for CO2 Sequestration

“…These peaks coincided with those in the JCPDS database for magnetic materials (82-1533), thus indicating a crystalline cubic spinel structure for the Fe 3 O 4 nanoparticles. [11] Fe 3 O 4 /SiO 2 displayed a broad peak at 2q = 238, which indicated the presence of an amorphous silica structure. The remaining XRD peaks corresponded to structural features of the Fe 3 O 4 particles ( Figure S1b Figure S3 in the Supporting Information), thus illustrating that each particle was surface-functionalized by the nitrogen-containing OAPS groups.…”

Electronic properties of the n-type PDI8-CN2organic semiconductor at the interface with SiO2: addressing the role of adsorbed water molecules by means of optical second-harmonic generation

“…Even if no specific studies on the nature of PL-active states in PDI8-CN 2 are available, interesting considerations can be nevertheless expounded from our PL and PLE findings. To this aim, it is worth citing a recent in situ PL analysis performed on molecular films of perylene cores [41] evidencing room-temperature spectral contributions originating from excimer states and from defect states, where the former is significantly red-shifted (Δ ≈ E 540 meV) with respect to the 0-0 monomer transition [40,42]. These results are very close to the ones here reported for PDI8-CN 2 , whose PL also can be decomposed as a superposition of two contributes, one approximately peaked at E a = 1.76 eV and another at about E b = 1.90 eV.…”