Bright emission and high photoluminescence CsPb2Br5 NCs encapsulated in mesoporous silica with ultrahigh stability and excellent optical properties for white light-emitting diodes

2019 ◽  
Vol 7 (43) ◽  
pp. 13585-13593 ◽  
Author(s):  
Guangzhan Shao ◽  
Yi Zhao ◽  
Yanxia Yu ◽  
Haisheng Yang ◽  
Xiaodong Liu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Mesoporous Silica ◽  
White Light ◽  
Light Emitting Diodes ◽  
Optoelectronic Properties ◽  
Light Emitting ◽  
Halide Perovskite ◽  
White Light Emitting Diodes ◽  
Lead Halide ◽  
Bright Emission

All-inorganic cesium lead halide perovskite CsPb2Br5 nanocrystals (NCs) have attracted tremendous attention owing to their unique optoelectronic properties.

scholarly journals Zn-Alloyed All-Inorganic Halide Perovskite-Based White Light-Emitting Diodes with Superior Color Quality

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Saroj Thapa ◽  
Gopi Chandra Adhikari ◽  
Hongyang Zhu ◽  
Alexei Grigoriev ◽  
Peifen Zhu
Keyword(s):  
Optical Properties ◽  
White Light ◽  
Light Emitting Diodes ◽  
Transition Metal Ions ◽  
Color Temperature ◽  
Lattice Contraction ◽  
Light Emitting ◽  
Practical Applications ◽  
Halide Perovskite ◽  
White Light Emitting Diodes

AbstractRecently, lead halide perovskite nanocrystals (NCs) have gained tremendous attention in optoelectronic devices due to their excellent optical properties. However, the toxicity of lead limits their practical applications. Here, the synthesis of Zn2+-alloyed CsZnxPb1-xX3 (up to 15%) NCs is reported to achieve lead-reduced white light-emitting diodes (WLEDs). The incorporation of Zn2+ into CsPbX3 host NCs results in a lattice contraction, without altering the structure and morphology, which has a direct effect on the optical properties. The blue-shifts in the photoluminescence emission and increase in bandgap is observed while retaining high photoluminescence quantum yield. Then by engineering the different compositions of halides for 15% Zn2+-alloyed CsZnxPb1-xX3 NCs, tunable emission (411–636 nm) is obtained. Notably, the WLEDs are experimentally demonstrated employing the lead-reduced NCs (blue, green, yellow, and red). By varying the ratios of the amount of NCs, white lights with a tunable correlated-color temperature (2218–8335 K), an exemplary color-rendering index (up to 93) and high luminous efficacy of radiation (268–318 lm·W−1) are obtained. Best of our knowledge, these are superior to other reported WLEDs based on CsPbX3 NCs doped with transition metal ions. This work places the halide perovskite NCs one-step closer in designing the environmentally benign and energy-efficient WLEDs.

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