Impurity Ions Codoped Cesium Lead Halide Perovskite Nanocrystals with Bright White Light Emission toward Ultraviolet–White Light-Emitting Diode

All-inorganic lead halide perovskite (CsPbX3) nanocrystals (NCs) have emerged as a highly promising new generation of light emitters due to their extraordinary photophysical properties. However, the performance of these semiconducting NCs is undermined due to the inherent toxicity of lead and long-term environmental stability. Here, we report the addition of B-site cation and X-site anion (pseudo-halide) concurrently using Ba(SCN)2 (≤50%) in CsPbX3 NCs to reduce the lead and improve the photophysical properties and stability. The as-grown particles demonstrated an analogous structure with an almost identical lattice constant and a fluctuation of particle size without altering the morphology of particles. Photoluminescence quantum yield is enhanced up to near unity (~98%) by taking advantage of concomitant doping at the B- and X-site of the structure. Benefitted from the defect reductions and stronger bonding interaction between Pb2+ and SCN− ions, Ba(SCN)2-based NCs exhibit improved stability towards air and moisture compared to the host NCs. The doped NCs retain higher PLQY (as high as seven times) compared to the host NCs) when stored in an ambient atmosphere for more than 176 days. A novel 3D-printed multiplex color conversion layer was used to fabricate a white light-emitting diode (LED). The obtained white light shows a correlated color temperature of 6764 K, a color rendering index of 87, and luminous efficacy of radiation of 333 lm/W. In summary, this work proposes a facile route to treat sensitive lead halide perovskite NCs and to fabricate LEDs by using a low-cost large-scale 3-D printing method, which would serve as a foundation for fabricating high-quality optoelectronic devices for near future lighting technologies.

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Cu doping-enhanced emission efficiency of Mn2+ in cesium lead halide perovskite nanocrystals for efficient white light-emitting diodes

Journal of Luminescence ◽

10.1016/j.jlumin.2020.117586 ◽

2020 ◽

Vol 227 ◽

pp. 117586

Author(s):

Yuzhu Zheng ◽

Xi Yuan ◽

Jian Yang ◽

Qiuyan Li ◽

Xinxuan Yang ◽

...

Keyword(s):

White Light ◽

Light Emitting Diodes ◽

Cu Doping ◽

Light Emitting ◽

Perovskite Nanocrystals ◽

Emission Efficiency ◽

Halide Perovskite ◽

White Light Emitting Diodes ◽

Lead Halide

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White light emission from InGaN/organic molecule light-emitting diode

2013 Conference on Lasers and Electro-Optics Pacific Rim (CLEOPR) ◽

10.1109/cleopr.2013.6600382 ◽

2013 ◽

Author(s):

Zhounan Yue ◽

Yuk Fai Cheung ◽

Hoi Wai Choi ◽

Zujin Zhao ◽

Ben Zhong Tang ◽

...

Keyword(s):

White Light ◽

Organic Molecule ◽

Light Emission ◽

Light Emitting Diode ◽

White Light Emission ◽

Light Emitting

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Tunable luminescence from Sm3+, Ce3+ codoped Al2O3–La2O3–SiO2 glasses for white light emission

Journal of Materials Research ◽

10.1557/jmr.2009.0191 ◽

2009 ◽

Vol 24 (5) ◽

pp. 1730-1734 ◽

Cited By ~ 9

Author(s):

Hucheng Yang ◽

G. Lakshminarayana ◽

Yu Teng ◽

Shifeng Zhou ◽

Jianrong Qiu

Keyword(s):

Energy Transfer ◽

White Light ◽

Spectral Properties ◽

Light Emission ◽

Light Emitting Diode ◽

Fluorescence Decay ◽

White Light Emission ◽

Luminescence Properties ◽

Light Emitting ◽

Luminescence Efficiency

Sm3+, Ce3+ codoped Al2O3–La2O3–SiO2 glasses were prepared and their luminescence properties were characterized. Blue-cyan to orange-red tunable luminescence was observed from these glasses with different excitation wavelengths ranging from 385 to 410 nm. White light emission with internal luminescence efficiency 42% has been observed using commercially available purple light-emitting-diode excitation. The energy transfer between Ce3+ and Sm3+ has also been investigated from fluorescence decay curves and spectral properties.

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White light emission from a polymer blend light emitting diode

Applied Physics Letters ◽

10.1063/1.116129 ◽

1996 ◽

Vol 68 (2) ◽

pp. 147-149 ◽

Cited By ~ 273

Author(s):

Magnus Granström ◽

Olle Inganäs

Keyword(s):

Polymer Blend ◽

White Light ◽

Light Emission ◽

Light Emitting Diode ◽

White Light Emission ◽

Light Emitting

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Controllable Synthesis of All Inorganic Lead Halide Perovskite Nanocrystals with Various Appearances in Multiligand Reaction System

Nanomaterials ◽

10.3390/nano9121751 ◽

2019 ◽

Vol 9 (12) ◽

pp. 1751 ◽

Cited By ~ 6

Author(s):

Chen Chen ◽

Louwen Zhang ◽

Tielin Shi ◽

Guanglan Liao ◽

Zirong Tang

Keyword(s):

Light Emitting Diode ◽

Dominant Role ◽

Photophysical Properties ◽

Reaction System ◽

Visible Spectrum ◽

Peanut Oil ◽

Light Emitting ◽

Perovskite Nanocrystals ◽

Halide Perovskite ◽

Lead Halide

All inorganic cesium lead halide (CsPbX3, X = Cl, Br, I) perovskite nanocrystals (PNCs) exhibit promising applications in light-emitting devices due to their excellent photophysical properties. Herein, we developed a low-cost and convenient method for the preparation of CsPbX3 PNCs in a multiligand-assisted reaction system where peanut oil is applied as a ligand source. The mixed-halide PNCs with tunable optical-band gap were prepared by mixing the single-halide perovskite solutions at room temperature. The resulting PNCs had good monodispersity, with dimensions of 8–10 nm, high photoluminescence quantum yield (96.9%), narrow emission widths (15–34 nm), and tunable emission wavelength (408–694 nm), covering the entire visible spectrum. Additionally, various morphologies of PNCs, such as nanospheres, nanocubes, and nanowires, were obtained by controlling reaction temperature and time, and the amount of oleamine with multiple ligands in peanut oil potentially playing a dominant role in the nucleation/growth processes of our PNCs. Finally, the resulting CsPbBr3 PNCs were employed to develop a white light-emitting diode (WLED), demonstrating the potential lighting applications for our method.

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