Development of mesoporous structures of composite silica particles with various organic functional groups in the presence and absence of ammonia catalyst

Park, Tae Jae; Jung, Gyu Il; Kim, Euk Hyun; Koo, Sang Man

doi:10.1007/s11051-017-3928-1

Cited by 5 publications

(1 citation statement)

References 26 publications

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“…Mesoporous silica nanoparticles (MSNs) have been used intensively as delivery system for biomedical applications, as well as encapsulation material for down-conversion LEDs [25,35]. By controlling synthesis condition, MSNs with different pore size and morphology for different application have been prepared [35,36] Similar results also can be concluded for Mn:CsPb(IBr) 3 QDs and silica-coated Mn:CsPb(IBr) 3 QDs according to SEM and the element mapping iamges shown in figure 5. With the consideration that the CsPbBr 3 and Mn:CsPb(BrI) 3 QDs were synthesized by mixing the commercial MSNs with the precursor for preparing these dots at the very beginning, so that these dots had the opportunity to grow in the porous network of the mesoporous silica.…”

Section: Structural Analysismentioning

confidence: 54%

Investigation on the stability improvement of hybrid halide all-inorganic perovskite quantum dots

Cheng¹,

Li²,

Fang³

et al. 2022

Nanotechnology

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Perovskite quantum dots (QDs) with stable luminous properties are crucial to for the construction of corresponding light-emitting diodes (LEDs). Hybrid halide perovskite QDs, especially those contain iodine element emitting red light, usually demonstrate poor emission stability owing to the halide segregation. Moreover, red component is indispensable for the construction of white LEDs (WLEDs). Hence, it is essential to improve the luminous stability of hybrid halide perovskite QDs containing iodine element. Here, magnesium dopant and silica matrix were employed to improve the stability of hybrid halide CsPb(IBr)3 QDs. Red, green and blue are three primary colors for constructing WLEDs. Therefore, silica-coated CsPbBr3 QDs emitting green light were also synthesized. The fabricated silica-coated Mn:CsPb(IBr)3/PMMA film delivered good emission stability during a 42-day observation period, exhibiting the improved stability compared with the corresponding Mn:CsPb(IBr)3 QDs in solution. WLEDs were fabricated by integrating the mixture of silica-coated Mn:CsPb(IBr)3 QDs, silica-coated CsPbBr3 QDs and silicon sealant with a blue-emission LED chip. The as fabricated device exhibited a longer lifetime to be lit than that of those reported previously. During the 36-day observation period for the as fabricated device, the red emission from the silica-coated Mn:CsPb(IBr)3 QDs experienced a peak-emission shift of 34 nm, which is much less than that in Mn:CsPb(IBr)3 QDs solution. Their overall intensity downtrend combined the peak-emission shift are responsible for the spectrum shape change, so as to the fluctuation of color correlated temperature (CCT) and color rendering index (CRI). Our study provides a good starting point for the further improvement of the stability of the hybrid halide perovskites QDs and the corresponding light-emitting devices. With deep studies on the synthesis method and luminous mechanism for hybrid halide CsPb(IBr)3 QDs, red-emission perovskite QDs with satisfied properties are expected to be obtained.

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