A solid-state light-emitting device based on ballistic electron excitation using an inorganic material as a fluorescent film

2003 ◽  
Vol 197 (2) ◽  
pp. 316-320 ◽  
Author(s):  
Yoshiki Nakajima ◽  
Hajime Toyama ◽  
Akira Kojima ◽  
Nobuyoshi Koshida
Keyword(s):  
Solid State ◽  
Inorganic Material ◽  
Electron Excitation ◽  
Light Emitting ◽  
Ballistic Electron

A Novel Solid-State Light-Emitting Device Based on Ballistic Electron Excitation

2000 ◽  
Vol 638 ◽  
Author(s):  
Y. Nakajima ◽  
A. Kojima ◽  
N. Koshida
Keyword(s):  
Solid State ◽  
Light Emission ◽  
Nanocrystalline Silicon ◽  
Electron Excitation ◽  
Si Substrate ◽  
Light Emitting ◽  
Direct Excitation ◽  
Ballistic Electron ◽  
Visible Luminescence ◽  
Controlled Structure

AbstractThe concept of a novel solid-state light-emitting device is proposed on a basis of our previous report that the nanocrystalline porous silicon (PS) diode with a well-controlled structure operate as an efficient ballistic electron emitter. This device is composed of a semitransparent thin Au film, a fluorescent thin film, a PS layer, and n-type Si substrate. When a positive bias voltage is applied to the Au electrode, visible luminescence is emitted of which band corresponds to that of the deposited fluorescent material. The optoelectronic characteristics suggest that the light emission is based on direct excitation of fluorescent film by ballistic electrons generated in the PS layer. This result indicates another possibility of nanocrystalline silicon for photonic applications.

A Solid-State Multicolor Light-Emitting Device Based on Ballistic Electron Excitation

2004 ◽  
Vol 43 (4B) ◽  
pp. 2076-2079 ◽  
Author(s):  
Yoshiki Nakajima ◽  
Tetsuya Uchida ◽  
Hajime Toyama ◽  
Akira Kojima ◽  
Bernard Gelloz ◽  
...  
Keyword(s):  
Solid State ◽  
Electron Excitation ◽  
Light Emitting ◽  
Ballistic Electron

A Solid-State Multicolor Light-Emitting Device Based on Ballistic Electron Excitations

2003 ◽  
Author(s):  
Yoshiki Nakajima ◽  
Tetsuya Uchida ◽  
Akira Kojima ◽  
Bernard Gelloz ◽  
Nobuyoshi Koshida
Keyword(s):  
Solid State ◽  
Light Emitting ◽  
Ballistic Electron ◽  
Electron Excitations

Single Molecule Solid State Light Emitting Electrochemical Cells with Lifetimes Superior to 3000 Hours

2008 ◽  
Author(s):  
Henk Bolink ◽  
Rubén D. Costa ◽  
Enrique Orti ◽  
Michele Sessolo ◽  
Stefan Graber ◽  
...  
Keyword(s):  
Solid State ◽  
Single Molecule ◽  
Electrochemical Cells ◽  
Light Emitting

scholarly journals Effect of Laser Irradiation on Emissivity of Flame-Generated Nanooxides

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2303
Author(s):  
Silvana De Iuliis ◽  
Roberto Dondè ◽  
Igor Altman
Keyword(s):  
Laser Irradiation ◽  
Light Emission ◽  
Energy Gap ◽  
Particle Temperature ◽  
Electron Excitation ◽  
Flame Spray ◽  
Energy Bands ◽  
Light Emitting ◽  
Spectral Behavior ◽  
The Difference

The application of pyrometry to retrieve particle temperature in particulate-generating flames strictly requires the knowledge of the spectral behavior of emissivity of light-emitting particles. Normally, this spectral behavior is considered time-independent. The current paper challenges this assumption and explains why the emissivity of oxide nanoparticles formed in flame can change with time. The suggested phenomenon is related to transitions of electrons between the valence and conduction energy bands in oxides that are wide-gap dielectrics. The emissivity change is particularly crucial for the interpretation of fast processes occurring during laser-induced experiments. In the present work, we compare the response of titania particles produced by a flame spray to the laser irradiation at two different excitation wavelengths. The difference in the temporal behavior of the corresponding light emission intensities is attributed to the different mechanisms of electron excitation during the laser pulse. Interband transitions that are possible only in the case of the laser photon energy exceeding the titania energy gap led to the increase of the electron density in the conduction band. Relaxation of those electrons back to the valence band is the origin of the observed emissivity drop after the UV laser irradiation.

Color Emission Carbon Dots with Quench-ResixAstant Solid-State Fluorescence for Light-Emitting Diodes

2021 ◽  
Vol 9 (10) ◽  
pp. 3901-3908
Author(s):  
Fanyong Yan ◽  
Hao Zhang ◽  
Jinxia Xu ◽  
Yawei Wu ◽  
Yueyan Zang ◽  
...  
Keyword(s):  
Solid State ◽  
Carbon Dots ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Solid State Fluorescence ◽  
Color Emission

Photoluminescence Properties of Ca3Si2O7: Pr3+ Orange-Red Phosphors Prepared by High-Temperature Solid-State Method

2018 ◽  
Vol 73 (6) ◽  
pp. 555-558 ◽  
Author(s):  
Zhi-Qing Peng ◽  
Rong Chen ◽  
Wen-Lin Feng
Keyword(s):  
Crystal Structure ◽  
High Temperature ◽  
Solid State ◽  
Solid State Method ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Red Phosphors ◽  
Typical Sample ◽  
State Method ◽  
Xrd Patterns

AbstractNovel luminescent materials Ca3-xSi2O7: xPr3+ were successfully prepared by the high-temperature solid-state method. The crystal structure, morphology, and optical spectrum were characterised by X-ray diffraction (XRD), scanning electron microscopy (SEM), and spectroscopy, respectively. The XRD patterns of the samples indicate that the crystal structure is monoclinic symmetry. The SEM shows that the selected sample has good crystallinity although its appearance is irregular and scalelike. The peak of the excitation spectrum of the sample is located at around 449 nm, corresponding to 3H4→3P2 transition of Pr3+. The peak of the emission spectrum of the sample is situated at around 612 nm which is attributed to 3P0→3H6 transition of Pr3+, and the colour is orange-red. The optimum concentration for Pr3+ replaced Ca2+ sites in Ca3Si2O7: Pr3+ is 0.75 mol%. The lifetime (8.48 μs) of a typical sample (Ca2.9925Pr0.0075)Si2O7 is obtained. It reveals that orange-red phosphors Ca3-xSi2O7: xPr3+ possess remarkable optical properties and can be used in white light emitting devices.

Sign in / Sign up

Export Citation Format

Share Document