scholarly journals Facile synthesis of solid-state fluorescent organosilica nanoparticles with a photoluminescence quantum yield of 73.3% for fingerprint recognition and white-light-emitting diodes

2021 ◽  
Author(s):  
Jiahao Liang ◽  
Yongzhong Wu ◽  
Xiao Gong ◽  
Alberto Vomiero
Keyword(s):  
Quantum Dots ◽  
Solid State ◽  
Fingerprint Recognition ◽  
Facile Synthesis ◽  
Light Emitting ◽  
Photoluminescence Quantum Yield ◽  
Fluorescent Materials ◽  
Low Toxicity ◽  
White Light Emitting Diodes ◽  
Fingerprint Detection

Silicon quantum dots (Si QDs)-based solid-state fluorescent materials have attracted widespread attention in latent fingerprint detection due to the high photoluminescence, low toxicity and good stability. However, it is still...

Room temperature synthesis of Sn2+ doped highly luminescent CsPbBr3 quantum dots for high CRI white light-emitting diodes

Nanoscale ◽  
2021 ◽  
Author(s):  
Dongdong Yan ◽  
Qionghua Mo ◽  
Shuangyi Zhao ◽  
Wensi Cai ◽  
Zhigang Zang
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
White Light ◽  
Room Temperature ◽  
Temperature Synthesis ◽  
Light Emitting ◽  
Photoluminescence Quantum Yield ◽  
Hot Injection ◽  
White Light Emitting Diodes ◽  
Cspbbr3 Quantum Dots

With a high photoluminescence quantum yield (PLQY) being able to exceed 90% for those prepared by hot injection method, CsPbBr3 quantum dots (QDs) have attracted intensive attentions for white light-emitting...

Promotion of solid-state lighting for ZnCdSe quantum dot modified-YAG-based white light-emitting diodes

RSC Advances ◽  
2016 ◽  
Vol 6 (57) ◽  
pp. 51989-51996 ◽  
Author(s):  
Shu-Ru Chung ◽  
Sheng-Shiun Chen ◽  
Kuan-Wen Wang ◽  
Cyuan-Bin Siao
Keyword(s):  
Solid State ◽  
Quantum Dot ◽  
White Light ◽  
Light Emitting Diodes ◽  
Solid State Lighting ◽  
Light Emitting ◽  
Photoluminescence Quantum Yield ◽  
Color Rendering Index ◽  
White Light Emitting Diodes ◽  
Color Rendering

In this study, the effect of quantum dot (QD) addition and photoluminescence quantum yield (PL QY) of QDs on the luminous efficacy and color rendering index (CRI) of white light-emitting diodes (LEDs) has been investigated.

Effect of Eu2O3 Concentration on the Properties of Red-Light-Emitting Sr1.5Ca0.5SiO4 Fluorescent Materials

NANO ◽  
2019 ◽  
Vol 14 (09) ◽  
pp. 1950110
Author(s):  
Jing Liu ◽  
Chia-Ching Wu ◽  
Cheng-Fu Yang ◽  
Lan-Sin Liou
Keyword(s):  
Solid State ◽  
White Light ◽  
Red Light ◽  
Solid State Reaction Method ◽  
Photoluminescence Spectra ◽  
Light Emitting ◽  
Reaction Method ◽  
Fluorescent Materials ◽  
Different Temperatures ◽  
White Light Emitting Diodes

Red-light-emitting phosphors based on Sr[Formula: see text]Ca[Formula: see text]SiO4 activated by trivalent europium ions (Eu[Formula: see text] were successfully synthesized using a solid-state reaction method, and their luminescence properties were investigated. The photoluminescence spectra of Sr[Formula: see text]Ca[Formula: see text]SiO4:[Formula: see text] Eu[Formula: see text] phosphors synthesized at different temperatures and times and with different Eu[Formula: see text] concentrations revealed emission peaks at 591[Formula: see text]nm, 612[Formula: see text]nm and 655[Formula: see text]nm, which can probably be attributed to the transition of Eu[Formula: see text] ions from 5D0 to 7FJ (J = 1, 2 and 3). The emission intensities of the transitions from 5D0 to 7FJ (J = 1, 2 and 3) increased as the synthesizing temperature rose for 2[Formula: see text]h. Comparison with the relevant International Commission on Illumination diagram showed that Sr[Formula: see text]Ca[Formula: see text]SiO4:[Formula: see text] Eu[Formula: see text] phosphors synthesized at different temperatures and times and with different Eu[Formula: see text] concentrations all emitted red light, with phosphors synthesized at 1300∘C and with concentrations of 1.5[Formula: see text]at.% yielding the maximum emission intensity. These results show Sr[Formula: see text]Ca[Formula: see text]SiO4:1.5% Eu[Formula: see text] to be a noteworthy red-light-emitting phosphor candidate for white light-emitting diodes (WLEDs).

scholarly journals Facile Preparation of Stable Solid-State Carbon Quantum Dots with Multi-Peak Emission

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 303 ◽  
Author(s):  
Yanning Zheng ◽  
Jingxia Zheng ◽  
Junli Wang ◽  
Yongzhen Yang ◽  
Taiping Lu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solid State ◽  
Carbon Quantum Dots ◽  
Color Temperature ◽  
Light Emitting ◽  
One Step ◽  
White Light Emitting Diodes ◽  
Color Rendering ◽  
Peak Emission

Aggregation-caused quenching (ACQ) effect, known as the main cause to restrain solid-state luminescence of carbon quantum dots (CQDs), hinders further application of CQDs in white light-emitting diodes (WLED). Here, a complex of CQDs and phthalimide crystals (CQDs/PC) was prepared through a one-step solvothermal method. CQDs/PC prevented CQDs from touching directly by embedding the CQDs in phthalimide crystal matrix in situ, which effectively reduced the ACQ effect. Furthermore, CQDs/PC exhibited multi-peak fluorescence spectra that span the green, yellow and orange spectral regions. Finally, a WLED fabricated based on CQDs/PC achieved a color-rendering index of 82 and a correlated color temperature of 5430 K. This work provides a quick and effective strategy to apply CQDs to WLED.

Direct blending of multicolor carbon quantum dots into fluorescent films for white light emitting diodes with an adjustable correlated color temperature

2019 ◽  
Vol 7 (6) ◽  
pp. 1502-1509 ◽  
Author(s):  
Yuanfei Ding ◽  
Jingxia Zheng ◽  
Junli Wang ◽  
Yongzhen Yang ◽  
Xuguang Liu
Keyword(s):  
Quantum Dots ◽  
Solid State ◽  
White Light ◽  
Light Emitting Diodes ◽  
Carbon Quantum Dots ◽  
Color Temperature ◽  
Light Emitting ◽  
Long Wavelength ◽  
White Light Emitting Diodes

The synthesis and luminescence origin of multicolour long wavelength CQDs and solid state luminous red-green-blue CQD films for CQD phosphor-based WLEDs with a high CRI and an adjustable CCT.

Carbon dots/ZnO quantum dots composite based white phosphors for white light-emitting diodes

2022 ◽  
Author(s):  
Xiao Gong ◽  
Wenjing Li ◽  
Min Wu ◽  
Hang Jiang ◽  
Longhui Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Dots ◽  
High Performance ◽  
Electrostatic Force ◽  
Facile Synthesis ◽  
Light Emitting ◽  
Zno Quantum Dots ◽  
White Light Emitting Diodes ◽  
Fluorescent Carbon Dots ◽  
Synthesis Approach

A facile synthesis approach to prepare eco-friendly white fluorescent carbon dots (CDs)/ZnO quantum dots (QDs) composites through electrostatic force was proposed, which can be used for fabrication of high-performance white...

53% Efficient Red Emissive Carbon Quantum Dots for High Color Rendering and Stable Warm White‐Light‐Emitting Diodes

2017 ◽  
Vol 29 (37) ◽  
pp. 1702910 ◽  
Author(s):  
Zifei Wang ◽  
Fanglong Yuan ◽  
Xiaohong Li ◽  
Yunchao Li ◽  
Haizheng Zhong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
White Light ◽  
Light Emitting Diodes ◽  
Carbon Quantum Dots ◽  
Light Emitting ◽  
Warm White Light ◽  
White Light Emitting Diodes ◽  
Color Rendering
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