Journal ArticleDOI
Luminescence of Free and Self Trapped Excitons in Pyrene
Atsuo Matsui,Hitoshi Nishimura +1 more
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TLDR
In this article, the resonance luminescence due to radiative annihilation of free excitons in Pyrene has been observed, and a thermal equilibrium is established between free and excimer states.Abstract:
The resonance luminescence due to radiative annihilation of free excitons in Pyrene has been observed. The luminescence band is located at 376 nm (F) at room temperature and is quite distinctive from so-called excimer luminescence band located at 450 nm. There is a potential barrier between the free exciton state and the excimer state which is located 540 cm -1 (66 meV) lower in energy with respect to the free exciton state. The luminescence decays exponentially with a life time of 180 nsec for both free excitons and excimers at 282 K. Discussion is given to explain free exciton creation and luminescence processes in terms of thermal equilibrium established between free excitons and excimers. The excimer is recognized as the self trapped exciton.read more
Citations
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Journal ArticleDOI
Tuning the Luminescence of Layered Halide Perovskites.
TL;DR: This review highlights the different types of photoluminescence that may be attained from layered halide perovskites, with an emphasis on how the emission may be systematically tuned through changes to the bulk crystalline lattice: changes in composition, structure, and dimensionality.
Journal ArticleDOI
Mechanism for Broadband White-Light Emission from Two-Dimensional (110) Hybrid Perovskites
Te Hu,Te Hu,Matthew D. Smith,Emma R. Dohner,Meng-Ju Sher,Xiaoxi Wu,M. Tuan Trinh,Alan Fisher,Jeff Corbett,Xiaoyang Zhu,Hemamala I. Karunadasa,Aaron M. Lindenberg,Aaron M. Lindenberg +12 more
TL;DR: The results are consistent with photogenerated carriers self-trapped in a deformable lattice due to strong electron-phonon coupling, where permanent lattice defects and correlated self-Trapped states lend further inhomogeneity to the excited-state potential energy surface.
Journal ArticleDOI
Structural origins of broadband emission from layered Pb–Br hybrid perovskites
TL;DR: In this article, structural and optical studies of a series of two-dimensional hybrid perovskites were conducted, and it was shown that broadband emission upon near-ultraviolet excitation is common to (001) lead-bromide perovsites.
Journal ArticleDOI
Recent progress of zero-dimensional luminescent metal halides
TL;DR: In this paper, a comprehensive review of all-inorganic/organicinorganic hybrid metal halides is presented, focusing on the self-trapped excitons (STEs) model and PL regulation engineering.
Journal ArticleDOI
Study of localized and extended excitons in 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) I. Spectroscopic properties of thin films and solutions
TL;DR: In this article, a comprehensive model for the low energy excitonic states in 3,4,9,10-perylenetetetracarboxylic dianhydride (PTCDA) was proposed.
References
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Journal ArticleDOI
The Electronic Spectra of Aromatic Molecular Crystals. II. The Crystal Structure and Spectra of Perylene
TL;DR: In this article, a new crystalline form of perylene has been found and its crystal structure has been determined by the two-dimensional X-ray diffraction method, which is explained as a stabilization of the lowest excited singlet state by a charge-transfer resonance interaction between the molecules in a pair.
Journal ArticleDOI
Absorption and Fluorescence Spectra of Crystalline Pyrene
TL;DR: In this paper, a Davydov splitting of about 18 cm-1 was detected with the a polarization at higher energy than the b polarization, consistent with the only theoretical prediction of energy levels in the molecule.
Journal ArticleDOI
Excimer fluorescence XII The pyrene crystal excimer interaction potential.
J. B. Birks,A. A. Kazzaz +1 more
TL;DR: In this article, an exciton resonance state originating from the Ba state of the pyrene molecule was determined as a function of the intermolecular separationr (A) function.
Journal ArticleDOI
The observation of the excimer formation process in pyrene and perylene crystals using a picosecond ruby laser and streak camera
TL;DR: The rise curves of fluorescence from the excimer excitons in pyrene and perylene crystals were observed with the use of the equipment for fluorescence lifetime measurements in the picosecond region.
Journal ArticleDOI
Luminescence from Exciton and V K -Plus-Electron States in Alkali Halide Crystals
TL;DR: In this paper, a model is set up for the local relaxation of the crystal into a ${V}_{K}$-like or diatomic molecule configuration, which can give the correct results for the emission energy in KCl, NaI, KI, and RbI.
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