Dense nanosized europium silicate clusters induced light emission enhancement in Eu-doped silicon oxycarbide films

Rare earth (Tb or Ce)-doped silicon oxides were deposited by electron cyclotron resonance plasma-enhanced chemical vapour deposition (ECR-PECVD). Silicon nanocrystals (Si-ncs) were formed in the silicon-rich films during certain annealing processes. Photoluminescence (PL) properties of the films were found to be highly dependent on the deposition parameters and annealing conditions. We propose that the presence of a novel sensitizer in the Tb-doped oxygen-rich films is responsible for the indirect excitation of the Tb emission, while in the Tb-doped silicon-rich films the Tb emission is excited by the Si-ncs through an exciton-mediated energy transfer. In the Ce-doped oxygen-rich films, an abrupt increase of the Ce emission intensity was observed after annealing at 1200∘C. This effect is tentatively attributed to the formation of Ce silicate. In the Ce-doped silicon-rich films, the Ce emission was absent at annealing temperatures lower than 1100∘C due to the strong absorption of Si-ncs. Optimal film compositions and annealing conditions for maximizing the PL intensities of the rare earths in the films have been determined. The light emissions from these films were very bright and can be easily observed even under room lighting conditions.

Download Full-text

N, S-doped silicon oxycarbide-drived carbon/amorphous ball-flower-like NiO as high performance electrode in asymmetric supercapacitors

Ceramics International ◽

10.1016/j.ceramint.2021.06.211 ◽

2021 ◽

Author(s):

Jianmei Pan ◽

Wenqiang Zhong ◽

Zimo Gao ◽

Xiaoxue Yang ◽

Yahai Zhang ◽

...

Keyword(s):

High Performance ◽

Silicon Oxycarbide ◽

Asymmetric Supercapacitors ◽

Doped Silicon

Download Full-text

Synthesis and luminescent properties of novel Eu2+-doped silicon oxycarbide glasses

Optical Materials ◽

10.1016/s0925-3467(03)00162-9 ◽

2004 ◽

Vol 24 (4) ◽

pp. 601-605 ◽

Cited By ~ 18

Author(s):

Yujun Zhang ◽

Alberto Quaranta ◽

Gian Domenico Soraru

Keyword(s):

Luminescent Properties ◽

Silicon Oxycarbide ◽

Doped Silicon ◽

Silicon Oxycarbide Glasses

Download Full-text

Light Emission Enhancement by Tuning the Structural Phase of APbBr3 (A = CH3NH3, Cs) Perovskites

The Journal of Physical Chemistry Letters ◽

10.1021/acs.jpclett.9b00829 ◽

2019 ◽

Vol 10 (9) ◽

pp. 2135-2142 ◽

Cited By ~ 4

Author(s):

Yung Ji Choi ◽

Lamjed Debbichi ◽

Do-Kyoung Lee ◽

Nam-Gyu Park ◽

Hyungjun Kim ◽

...

Keyword(s):

Light Emission ◽

Structural Phase ◽

Emission Enhancement

Download Full-text

A single-state fluorescent with bright white-light emission in the solid station and aggregation-induced emission enhancement compound for Pd0 detection

Talanta ◽

10.1016/j.talanta.2017.11.002 ◽

2018 ◽

Vol 179 ◽

pp. 177-185 ◽

Cited By ~ 7

Author(s):

Yan Zhang ◽

Yexin Li ◽

Xiaofeng Yang ◽

Yiming Ding ◽

Zongshi Zhao ◽

...

Keyword(s):

White Light ◽

Light Emission ◽

White Light Emission ◽

Aggregation Induced Emission ◽

Emission Enhancement ◽

Bright White Light ◽

Single State

Download Full-text

Design, concepts, and applications of electromagnetic metasurfaces

Nanophotonics ◽

10.1515/nanoph-2017-0119 ◽

2018 ◽

Vol 7 (6) ◽

pp. 1095-1116 ◽

Cited By ~ 50

Author(s):

Karim Achouri ◽

Christophe Caloz

Keyword(s):

Second Harmonic Generation ◽

Harmonic Generation ◽

Light Emission ◽

Second Harmonic ◽

Historical Context ◽

Spatial Processing ◽

Tensor Model ◽

Susceptibility Tensor ◽

Design Concepts ◽

Emission Enhancement

AbstractThe paper overviews our recent work on the synthesis of metasurfaces and related concepts and applications. The synthesis is based on generalized sheet transition conditions (GSTCs) with a bianisotropic surface susceptibility tensor model of the metasurface structure. We first place metasurfaces in a proper historical context and describe the GSTC technique with some fundamental susceptibility tensor considerations. On this basis, we next provide an in-depth development of our susceptibility-GSTC synthesis technique. Finally, we present five recent metasurface concepts and applications, which cover the topics of birefringent transformations, bianisotropic refraction, light emission enhancement, remote spatial processing, and nonlinear second-harmonic generation.

Download Full-text

Light Emission from Intrinsic and Doped Silicon-Rich Silicon Oxide: from the Visible to 1.6 ΜM

MRS Proceedings ◽

10.1557/proc-452-523 ◽

1996 ◽

Vol 452 ◽

Cited By ~ 2

Author(s):

L. Tsybeskov ◽

K. L. Moore ◽

P. M. Fauchet ◽

D. G. Hall

Keyword(s):

Rare Earth ◽

External Quantum Efficiency ◽

Room Temperature ◽

Structural Modification ◽

Silicon Oxide ◽

Light Emission ◽

Crystalline Silicon ◽

Light Emitting ◽

Infra Red ◽

Doped Silicon

AbstractSilicon-rich silicon oxide (SRSO) films were prepared by thermal oxidation (700°C-950°C) of electrochemically etched crystalline silicon (c-Si). The annealing-oxidation conditions are responsible for the chemical and structural modification of SRSO as well as for the intrinsic light-emission in the visible and near infra-red spectral regions (2.0–1.8 eV, 1.6 eV and 1.1 eV). The extrinsic photoluminescence (PL) is produced by doping (via electroplating or ion implantation) with rare-earth (R-E) ions (Nd at 1.06 μm, Er at 1.5 μm) and chalcogens (S at ∼1.6 μm). The impurities can be localized within the Si grains (S), in the SiO matrix (Nd, Er) or at the Si-SiO interface (Er). The Er-related PL in SRSO was studied in detail: the maximum PL external quantum efficiency (EQE) of 0.01–0.1% was found in samples annealed at 900°C in diluted oxygen (∼ 10% in N2). The integrated PL temperature dependence is weak from 12K to 300K. Light emitting diodes (LEDs) with an active layer made of an intrinsic and doped SRSO are manufactured and studied: room temperature electroluminescence (EL) from the visible to 1.6 μmhas been demonstrated.

Download Full-text

Synthesis and Spectroscopic Characteristics of Ligands Based on Quinolin-8-Ol as Useful Precursors for Alq3 Type Complexes

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.903.168 ◽

2021 ◽

Vol 903 ◽

pp. 168-173

Author(s):

Elmārs Zariņš ◽

Deins Alksnis ◽

Patricija Paulsone ◽

Karlis Balodis ◽

Aivars Vembris ◽

...

Keyword(s):

Solid State ◽

Light Emission ◽

Emission Property ◽

Blue Luminescence ◽

Reaction Conditions ◽

Aggregation Induced Emission ◽

Chemical Structures ◽

Emission Enhancement ◽

Spectroscopic Characteristics ◽

Reliable Methods

In order to develop reliable methods for the synthesis of various 5-substituted-8-oxyquinoline derivatives for the preparation of Alq3-type complexes, we have improved the reaction conditions on some syntheses described in the literature, successfully synthesized new ligands based on quinolin-8-ol and characterized their chemical structures by NMR. Some of the synthesized quinolin-8-ol derivatives containing incorporated bulky triphenyl or tert-butyl groups showed blue luminescence in the solid state due to the possible aggregation induced emission enhancement (AIEE) with a maximum wavelength around 510 nm. More detailed light-emission property investigation of the mentioned bulky group containing compounds is currently underway.

Download Full-text