Spectral Characteristics of Native Defects in BN

Bērziņa, B.; Trinkler, L.; Atobe, K.

doi:10.1002/pssc.200390078

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…The photoluminescence measurements were made using apparatus described in Ref. [14], consisting of two monochromators to filter the exciting and luminescence light, a 400 W deuterium lamp, and photomultiplier detection.…”

Section: Methodsmentioning

confidence: 99%

Exciton luminescence of boron nitride nanotubes and nano‐arches

Bērziņa

Trinkler

Korsak

et al. 2006

Physica Status Solidi (b)

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. The nanotube phase exhibits a broad-band PL near 380 nm, in agreement with a published report of cathodoluminescence from a sample comprising > 90% nanotubes. This emission is almost 3 eV lower in energy than unrelaxed exciton states found in recent all-electron theories of nt-BN and h-BN and about 1.4 eV lower than the lowest (perturbed dark?) exciton seen in absorption of nt-BN. This may suggest that excitons in nt-BN vibrationally relax to self-trapped states before emitting, a path found in many wide-gap solids, especially in quasi-1-dimensional forms. Exciton emission from bulk single-crystal h-BN has been shown to occur from vibrationally unrelaxed (free-exciton) states. We suggest a hypothesis in which known nano-arch reconstructions on the surface of h-BN may provide the low-dimensional environment to make exciton self-trapping on the surfaces of h-BN likely. This allows consistent interpretaton of the surface-related 380 nm emission from h-BN powder within a half-nanotube self-trapped exciton hypothesis.

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Section: Methodsmentioning

confidence: 99%

Exciton luminescence of boron nitride nanotubes and nano‐arches

Bērziņa

Trinkler

Korsak

et al. 2006

Physica Status Solidi (b)

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“…The experimental apparatus described in Ref. [6] consists of two monochromators to filter the exciting and luminescence light; a powerful deuterium lamp LDD-400 (with 400 W power) for luminescence continuous wave excitation and recording system of luminescence light based on photoelectron multiplier. The directions of exciting light and luminescence light recorded form a right angle.…”

Section: Methodsmentioning

confidence: 99%

“…Studying the excitation thresholds of the photoluminescence bands and correlating with expectations of band gaps can help in distinguishing h-BN, BN-nt, and impurity contributions to the spectra. In view of previous studies in the Riga laboratory of cubic-BN ceramic [6], and the fact that cubic-BN is the other structural paradigm in this intended study, single crystal samples [7] of c-BN have been included.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence excitation spectroscopy in boron nitride nanotubes compared to microcrystalline h‐BN and c‐BN

Bērziņa

Trinkler

Krutohvostov

et al. 2005

phys. stat. sol. (c)

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PACS 78.67.-n Photoluminescence spectra and photoluminescence excitation spectra have been measured on samples of hexagonal boron nitride microcrystalline powder, cubic boron nitride single crystal, and boron nitride nanotubes (mixture of single-walled and multi-walled with some h-BN precursor). The reason for studying these 3 samples in a comparative fashion is that nanotube BN, while based on a rolled hexagonal-BN (sp 2 -bonded) sheet, is expected to take on more sp 3 bond-character reminiscent of cubic-BN as the curvature becomes tighter. With some simplicity of statement, this study was planned to view spectroscopy of nanotube BN with respect to its two limiting cases of bond character, all measured in the same apparatus. Because of the mixed character of presently available BN nanotube samples, we consider it important to measure not just the luminescence spectra, but the tuneable-uv excitation spectra, and thereby hope to make connection with the band gaps and distinguish possible defect or impurity features.

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“…One intense absorption band is centered at 221 nm (5.61 eV), which was different from that of single crystal c-BN (6.1–6.4 eV) and h-BN (5.7–6.0 eV). − Besides, PL emission spectroscopy was also employed to characterize the E-BN samples by excitation with a laser line at 254 nm. The PL spectrum (Figure b) was dominated by a band centered at 383 nm (3.24 eV), and two other less intensive bands appear at 323 nm (3.84 eV) and 401 nm (3.09 eV), which was different from that of c-BN (2.4–2.6 eV) and h-BN (3.4–3.8 eV). − Actually, these optical results may be influenced by the morphology, structure, residual impurities, and intrinsic defect of E-BN samples, such as band-to-band optical transition and B or N vacancies . These optical properties of octahedron E-BN crystals will be the prerequisite of the potential applications in the fields of ultraviolet optoelectronics devices and ultraviolet lasers. , …”

Section: Resultsmentioning

confidence: 99%

Growth and Optical Properties of Explosion Phase Boron Nitride Octahedron Crystals

Wang

et al. 2013

Crystal Growth & Design

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A low temperature and high pressure synthetic route assisted with ball milling has been established to prepare high quality orientated explosion phase boron nitride (E-BN) octahedron crystals using H 3 BO 3 , iron powders, NH 4 Cl, and Mg as starting materials. FSEM, TEM, HRTEM, SAED, XRD, Raman, FTIR, and XPS were employed for characterization of the morphology and structure of as-synthesized E-BN samples. The E-BN was identified as the face-centered cubic structure with a lattice parameter of 8.245 Å. The typical particle sizes were mainly in the range of 30−120 nm. A UV spectrum indicated that the product has an obvious absorption band (5.61 eV). Photoluminescence spectra revealed that it has a dominant ultraviolet emission peak at 383 nm. The possible chemical reactions as well as the proposed mechanism of the growth of E-BN octahedron crystals were also discussed.

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Spectral Characteristics of Native Defects in BN

Cited by 7 publications

References 7 publications

Exciton luminescence of boron nitride nanotubes and nano‐arches

Exciton luminescence of boron nitride nanotubes and nano‐arches

Photoluminescence excitation spectroscopy in boron nitride nanotubes compared to microcrystalline h‐BN and c‐BN

Growth and Optical Properties of Explosion Phase Boron Nitride Octahedron Crystals

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