Bright Blue Light Emission of Ni2+ Ion-Doped CsPbClxBr3–x Perovskite Quantum Dots Enabling Efficient Light-Emitting Devices

2020 ◽  
Vol 12 (12) ◽  
pp. 14195-14202 ◽  
Author(s):  
Gencai Pan ◽  
Xue Bai ◽  
Wen Xu ◽  
Xu Chen ◽  
Yue Zhai ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Blue Light ◽  
Light Emission ◽  
Blue Light Emission ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Perovskite Quantum Dots ◽  
Bright Blue

Cavity Design and Optimization of Hybrid Quantum Dot Organic Light Emitting Devices for Blue Light Emission

2020 ◽  
Vol 15 (11) ◽  
pp. 1364-1373
Author(s):  
Iman E. Shaaban ◽  
Ahmed S. Samra ◽  
Bedir Yousif ◽  
N. A. Alghamdi ◽  
Shamia El-Sherbiny ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Blue Light ◽  
Light Emission ◽  
Cdse Qds ◽  
Blue Light Emission ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Organic Light Emitting Devices

The present search handles the blue light emission investigation of hybrid quantum dots organic light-emitting devices. The emissions at 445 nm and 460 nm have been examined for microcavity hybrid quantum dot organic light-emitting devices (QD-OLED) upon quantum dots of CdS and CdSe. External light emissions have been evaluated through a numerical model based on the transfer matrix for electromagnetic plane waves. The devices' optical properties are investigated based on internal reflectance and cavity length by considering the architecture consisting of multilayers thin-film structures. The overall performance of the light-emitting devices with emission at 445 nm showed an improvement of the enhancement factor and narrowing outcoupling emission relative to the devices with emission at 460 nm. Besides, the light-emitting devices based on CdS QDs revealed better performance relative to the devices based on CdSe QDs.

Nucleation-Controlled Growth of Ultra-Small Perovskite Quantum Dots for Bright Blue Light-Emitting Diodes

2021 ◽  
Author(s):  
Limin Wu ◽  
Shuhua Tu ◽  
Min Chen
Keyword(s):  
Quantum Dots ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Controlled Growth ◽  
Light Emitting ◽  
Highly Efficient ◽  
Synthesis Strategy ◽  
Perovskite Quantum Dots ◽  
Effective Synthesis ◽  
Bright Blue

Creating highly efficient and stable pure blue (≈ 470 nm) perovskite quantum dots (PQDs) remains a considerable challenge. Here, we report an effective synthesis strategy of ultra-small (≈ 3.8 nm)...

Synthesis and Properties of Novel Triphenylamine Derivatives Containing Bipyridine Units

2012 ◽  
Vol 554-556 ◽  
pp. 832-835
Author(s):  
Hai Jun Lv ◽  
Xiang Gao Li ◽  
Shi Rong Wang ◽  
Wen Zheng Gao
Keyword(s):  
Blue Light ◽  
Light Emission ◽  
Hole Injection ◽  
Blue Light Emission ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Solid Films ◽  
Hole Transporting ◽  
Hole Transporting Materials ◽  
Absolute Fluorescence

Compounds (S1-S3) containing triphenylamine donors, bipyridine acceptors and olefinic linkers were synthesized and characterized. Three compounds have excellent solubility in common solvents and tend to form solid films. The peaks of emission of S1-S3 are in the range of 476nm-504nm on solid films, corresponding to blue light emission. S1-S3 have fluorescence lifetime exceeding 2.05ns and absolute fluorescence quantum yield above 22% in dilute chloroform solutions. Three compounds possess glass-transition temperatures superior to 63°C. The HOMO levels are in the range of -5.17eV - -5.13eV to facilitate hole injection. The properties of S1-S3 indicate that these compounds are promising candidates as hole-transporting materials or blue light-emitting materials in organic light-emitting devices.

Enhanced blue-light emission on Cd0.9-xZn0.1CrxS(0 ≤ x ≤ 0.05) quantum dots

2019 ◽  
Vol 45 (3) ◽  
pp. 3833-3838 ◽  
Author(s):  
I. Devadoss ◽  
P. Sakthivel ◽  
S. Muthukumaran ◽  
N. Sudhakar
Keyword(s):  
Quantum Dots ◽  
Blue Light ◽  
Light Emission ◽  
Blue Light Emission

LUMINESCENCE BEHAVIOR AND MECHANISM OF LIGHT-EMITTING POROUS SILICON

1994 ◽  
Vol 08 (02) ◽  
pp. 69-92 ◽  
Author(s):  
XUN WANG
Keyword(s):  
Porous Silicon ◽  
Blue Light ◽  
Light Emission ◽  
Energy State ◽  
Surface Recombination Velocity ◽  
Luminescence Spectroscopy ◽  
Carrier Injection ◽  
Blue Light Emission ◽  
Light Emitting ◽  
Si Nanostructures

In this review article, we give a new insight into the luminescence mechanism of porous silicon. First, we observed a “pinning” characteristic of photoluminescent peaks for as-etched porous silicon samples. It was explained as resulting from the discontinuous variation of the size of Si nanostructures, i.e. the size quantization. A tight-binding calculation of the energy band gap widening versus the dimension of nanoscale Si based on the closed-shell Si cluster model agrees well with the experimental observations. Second, the blue-light emission from porous silicon was achieved by using boiling water treatment. By investigating the luminescence micrographic images and the decaying behaviors of PL spectra, it has been shown that the blue-light emission is believed to be originated from the porous silicon skeleton rather than the surface contaminations. The conditions for achieving blue light need proper size of Si nanostructures, low-surface recombination velocity, and mechanically strong skeleton. The fulfillment of these conditions simultaneously is possible but rather critical. Third, the exciton dynamics in light-emitting porous silicon is studied by using the temperature-dependent and picosecond time-resolved luminescence spectroscopy. A direct evidence of the existence of confined excitons induced by the quantum size effect has been revealed. Two excitation states are found to be responsible for the visible light emission, i.e. a higher lying energy state corresponding to the confined excitons in Si nanostructures and a lower lying state related with surfaces of Si wires or dots. A picture of the carrier transfer between the quantum confined state and the surface localized state has been proposed. Finally, we investigated the transient electroluminescence behaviors of Au/porous silicon/Si/Al structure and found it is very similar to that of an ordinary p-n junction light-emitting diode. The mechanism of electroluminescence is explained as the carrier injection through the Au/porous silicon Schotky barrier and the porous silicon/p-Si heterojunction into the corrugated Si wires, where the radiative recombination of carriers occurs.

Sign in / Sign up

Export Citation Format

Share Document