Inorganic halide perovskite quantum dot modified YAG-based white LEDs with superior performance

2016 ◽  
Vol 4 (32) ◽  
pp. 7601-7606 ◽  
Author(s):  
Jiangcong Zhou ◽  
Feng Huang ◽  
Hang Lin ◽  
Zebin Lin ◽  
Ju Xu ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Emission Band ◽  
Superior Performance ◽  
Quantum Yields ◽  
Excellent Performance ◽  
Luminous Efficacy ◽  
White Leds ◽  
Halide Perovskite ◽  
Narrow Emission ◽  
Tunable Emission

Inorganic perovskite CsPbBr3−xIx(x= 0–3) QDs with tunable emission wavelength, narrow emission band and high quantum yields were synthesized. The fabricated CsPbBrI2QD-modified WLEDs show excellent performance in luminous efficacy, CCT and CRI, which are quite stable at an operational current as high as 350 mA.

scholarly journals Microwave-Assisted Preparation of Luminescent Inorganic Materials: A Fast Route to Light Conversion and Storage Phosphors

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2882
Author(s):  
José Miranda de Carvalho ◽  
Cássio Cardoso Santos Pedroso ◽  
Matheus Salgado de Nichile Saula ◽  
Maria Claudia França Cunha Felinto ◽  
Hermi Felinto de Brito
Keyword(s):  
Rapid Heating ◽  
Inorganic Materials ◽  
Rapid Screening ◽  
Conventional Heating ◽  
Quantum Yields ◽  
Microwave Assisted Synthesis ◽  
Volumetric Heating ◽  
White Leds ◽  
Microwave Assisted ◽  
And Storage

Luminescent inorganic materials are used in several technological applications such as light-emitting displays, white LEDs for illumination, bioimaging, and photodynamic therapy. Usually, inorganic phosphors (e.g., complex oxides, silicates) need high temperatures and, in some cases, specific atmospheres to be formed or to obtain a homogeneous composition. Low ionic diffusion and high melting points of the precursors lead to long processing times in these solid-state syntheses with a cost in energy consumption when conventional heating methods are applied. Microwave-assisted synthesis relies on selective, volumetric heating attributed to the electromagnetic radiation interaction with the matter. The microwave heating allows for rapid heating rates and small temperature gradients yielding homogeneous, well-formed materials swiftly. Luminescent inorganic materials can benefit significantly from the microwave-assisted synthesis for high homogeneity, diverse morphology, and rapid screening of different compositions. The rapid screening allows for fast material investigation, whereas the benefits of enhanced homogeneity include improvement in the optical properties such as quantum yields and storage capacity.

Highly Emissive Halide Perovskite Nanocrystals: From Lead to Lead-Free

CrystEngComm ◽  
2021 ◽  
Author(s):  
Chunlong Li ◽  
Jie Li ◽  
Zhengping Li ◽  
Huayong Zhang ◽  
Yangyang Dang ◽  
...  
Keyword(s):  
Charge Carriers ◽  
Lead Free ◽  
Quantum Yields ◽  
Local Management ◽  
Perovskite Nanocrystals ◽  
Halide Perovskites ◽  
Halide Perovskite

Nanostructured halide perovskites have highly yielded record LEDs due to their higher versatility in the local management of charge carriers, which has enabled photoluminescence quantum yields (PLQYs) close to 100%....

scholarly journals Indenopyrans – synthesis and photoluminescence properties

2016 ◽  
Vol 12 ◽  
pp. 825-834 ◽  
Author(s):  
Andreea Petronela Diac ◽  
Ana-Maria Ţepeş ◽  
Albert Soran ◽  
Ion Grosu ◽  
Anamaria Terec ◽  
...  
Keyword(s):  
Solid State ◽  
Emission Band ◽  
Fluorescence Spectra ◽  
Photophysical Properties ◽  
Quantum Yields ◽  
Band Broadening ◽  
Photoluminescence Properties ◽  
Fluorescence Quantum Yields ◽  
Blue Emitters ◽  
Solid State Fluorescence

New indeno[1,2-c]pyran-3-ones bearing different substituents at the pyran moiety were synthesized and their photophysical properties were investigated. In solution all compounds were found to be blue emitters and the trans isomers exhibited significantly higher fluorescence quantum yields (relative to 9,10-diphenylanthracene) as compared to the corresponding cis isomers. The solid-state fluorescence spectra revealed an important red shift of λmax due to intermolecular interactions in the lattice, along with an emission-band broadening, as compared to the solution fluorescence spectra.

Nanocrystalline Phosphors for Lighting and Detection Applications

2010 ◽  
Vol 654-656 ◽  
pp. 1130-1133 ◽  
Author(s):  
Christopher J. Summers ◽  
Hisham M. Menkara ◽  
Richard A. Gilstrap ◽  
Mazen Menkara ◽  
Thomas Morris
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Shell Growth ◽  
Stokes Shift ◽  
Thermal Quenching ◽  
High Sensitivity ◽  
In Situ Monitoring ◽  
White Leds ◽  
Sensing Applications ◽  
Improved Stability

We report the development of new nanoparticle phosphors and quantum dot structures designed for applications to enhance the color rendering and efficiency of high brightness white LEDs, as well as for bio-sensing applications. The intrinsic problem of self-absorption, high toxicity, and high sensitivity to thermal quenching of conventional quantum dot systems has prevented their adoption to LED devices. Doped Cd-free quantum dots may circumvent these issues due to their distinct Stokes shift and improved stability at high temperature. We report on the modification of Mn-doped ZnSe/ZnS core-shell quantum dots for application to the (blue diode + yellow emitter) white LED system. Band gap tuning for 460 nm excitation, inorganic shell growth and in-situ monitoring for enhanced efficiency, and analysis of thermal stability will are reported.

Lu3(Al,Si)5(O,N)12:Ce3+ phosphors with broad emission band and high thermal stability for white LEDs

2015 ◽  
Vol 158 ◽  
pp. 322-327 ◽  
Author(s):  
Jiaqing Liu ◽  
Xiaojun Wang ◽  
Tongtong Xuan ◽  
Chunbo Wang ◽  
Huili Li ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Emission Band ◽  
High Thermal Stability ◽  
Broad Emission Band ◽  
White Leds ◽  
Broad Emission

scholarly journals Luminous Efficacy Enhancement for LED Lamps using Highly Reflective Quantum Dot-based Photoluminescent Films

2021 ◽  
Author(s):  
Binhai Yu ◽  
Zhou Lu ◽  
Guanwei Liang ◽  
Yikai Yuan ◽  
Hong Wang ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Luminous Efficacy

Quantum Dot/Plasmonic Nanoparticle Metachromophores with Quantum Yields That Vary with Excitation Wavelength

Nano Letters ◽  
2011 ◽  
Vol 11 (7) ◽  
pp. 2725-2730 ◽  
Author(s):  
Keiko Munechika ◽  
Yeechi Chen ◽  
Andreas F. Tillack ◽  
Abhishek P. Kulkarni ◽  
Ilan Jen-La Plante ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Quantum Yields ◽  
Excitation Wavelength ◽  
Plasmonic Nanoparticle
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