Enhancement in electro-optical properties of ferroelectric liquid crystal by doping perovskite CsPbBr<sub>3</sub> quantum dots

Doke, Swapnil; Shinde, Aparna; Reddy, ‬V. Raghavendra; Ganguly, Prasun

doi:10.1080/02678292.2019.1706769

Cited by 11 publications

(8 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 6 (c-d) illustrates the optical bright (B) and dark (D) state images QDs (7.3 nm (± 1.1 nm)) doped into the host material. The amount of QDs added to the NLC is in 0.05 weight percentage [14]. In this scenario, the light leakage observed is less as compared to the previous case.…”

Section: Methodsmentioning

confidence: 77%

“…There is an enhancement in PL intensity when CsPbBr3 QDs are doped into NLC with a particular amount. This specific weight percentage is optimized and reported as well [14]. Both samples give emissions wavelength at 392 nm without shift after being excited at the same wavelength (315 nm).…”

Section: Resultsmentioning

confidence: 99%

“…This results in increasing intensity for both cases without any change to the peaks. Therefore, an increase in PL intensity is observed due to the doping of CsPbBr3 QDs in NLC [7,14]. QDs are behaving in two ways that are, to align the NLC and increase the absorption by reducing the light leakage centres [6,14].…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, by incorporating QD in the NLC material, efforts can be made to improve the alignment [16]. When QDs are doped in NLC slight change in colour (lightening of colour) is observed (figure 6 (c) and (d)) due to a change in the refractive index of the NLC material [14]. Figure 6 (c-d) illustrates the optical bright (B) and dark (D) state images QDs (7.3 nm (± 1.1 nm)) doped into the host material.…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Enhancement in Photoluminescence of Nematic Liquid Crystals Doped with CsPbBr3 Quantum Dots

Sutar

Balwadkar

Doke³

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

We report the enhancement in photoluminescence (PL) of nematic liquid crystals (NLCs) doped with CsPbBr3 (perovskite) quantum dots (QDs). QDs play a vital role to enhance the PL intensity, which has been attributed to the increase in the planar alignment of NLC molecules by reducing light leakage centres and intrinsic defects. QDs were synthesized by the hot injection chemical method. The structural properties of QDs were examined by X-ray Diffraction (XRD) and Transmission Electron Microscopic (TEM) measurements. Orthorhombic crystallite structure of CsPbBr3 QDs without secondary phase formation was confirmed from XRD pattern. The particle size of QDs was calculated by TEM and found to be 7.3 (± 1.1) nm. The optical properties of QDs were studied by recording UV-Visible absorption and PL spectra at room temperature. The absorption spectrum reveals the excitonic peak at 509 nm and PL emission is observed at 514 nm. The chemically prepared QDs were further used to enhance the emission of NLC. Firstly, liquid crystal sample cells were fabricated by conventional polyimide technique. NLC doped with CsPbBr3 QDs were inserted into the sample cell via the capillary action. The filled sample cells were characterized by polarising optical microscope (POM) images and PL spectra measurements. The dark and bright state images of POM demonstrate the uniform alignment and homogeneous texture of liquid crystal molecules in both cells. The molecular alignment is further improved while the light leakage centres and defects were reduced after doping QDs in the host NLC material. This leads to a significant enhancement in absorption and hence the emission of NLC. We found the enhancement in PL intensity by 11% compared to pure NLC. The improved emission of NLC is attributed to modified molecular alignment in presence of QDs. Results based on present work will help to fabricate QDs based display devices with improved the optical contrast and lower the operating voltage

show abstract

Section: Methodsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Enhancement in Photoluminescence of Nematic Liquid Crystals Doped with CsPbBr3 Quantum Dots

Sutar

Balwadkar

Doke³

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…Several research groups have conducted studies for this purposes. Doke et al [14] managed to lower saturation voltage along with an enhancement in optical contrast, optical tilt angle and photoluminescence intensity by dispersing CsPbBr3 QDs in ferroelectric liquid crystals. Rastogi et al [15] observed memory effect memory due to storage of charge on CdZnS/ZnS QDs dispersed in fluorinated 4ʹ-alkylphenyl-4-isothiocyanatotolane liquid crystal mixtures.…”

Section: Introductionmentioning

confidence: 99%

Effects of CdTe Quantum Dot Dispersal on Current-Voltage Characteristics in Liquid Crystalline Mediums of E63, E7 and SCLP

Kocakülah

Kahyaoğlu

Yıldırım

et al. 2020

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

View full text Add to dashboard Cite

The usage of nano-sized quantum dots (QDs) particularly in guest-host based hybrid mediums revealed enhancements in electro-optical properties of the mediums, therefore the focus of considerable amount of contemporary studies has been about dispersal of QDs for improvements in medium. This study investigates the effects of CdTe QD dispersal on current-voltage characteristics of some liquid crystalline materials such as E63, E7 and SCLP. Current is increased for all samples due to QD dispersal, however the best improvement is obtained for E7. Hence, current-voltage characteristics of E7 and QD dispersed E7 mediums were also investigated under UV light exposure. Current values of both mediums were found to increase with increasing UV light power due to generation of electron-hole pairs. Photocurrent's dependence on light power revealed that QD dispersal does not affect recombination mechanism in the medium. On the other hand, UV light responsivity of QD dispersed E7 was obtained approximately twice of that of E7. Thus, it was concluded that CdTe QDs make considerable contribution to current-voltage and photoconductivity characteristics of E7 in dark and under UV light illumination.

show abstract

Leveraging Hierarchical Chirality in Perovskite(‐Inspired) Halides for Transformative Device Applications

Duan

Zhou

2022

Advanced Energy Materials

View full text Add to dashboard Cite

Chirality is an attribute based on the structural geometry of materials, which confers a distinctive energy band structure for intriguing optical, electronic, and spintronic properties. Recent studies on chirality encountered in perovskite(‐inspired) halides (PiHs) have drawn increasing attention, not only because of the large chemical diversity of PiHs seen at molecular, nanoscopic, and microscopic levels, but also due to the observation of various emergent properties for multifunctional device applications. Herein hierarchical chiral origin factors of PiHs, involving intercalation, substitution, and distortion at the intra‐crystal level; modification at the crystal interface level; and micro‐design beyond the crystal level are first discussed. Then, updated progress in synthesis and characterization methods of chiral PiHs is reviewed, featuring intriguing structures that distinguish chiral PiHs from other semiconductors and chiral materials. Furthermore, representative examples exploiting emergent properties of chiral PiH for achieving versatile device functions are examined. Finally, perspectives on challenges and opportunities in leveraging the chirality in PiHs for transformative device applications are provided.

show abstract

Enhancement in electro-optical properties of ferroelectric liquid crystal by doping perovskite CsPbBr₃ quantum dots

Cited by 11 publications

References 49 publications

Enhancement in Photoluminescence of Nematic Liquid Crystals Doped with CsPbBr3 Quantum Dots

Enhancement in Photoluminescence of Nematic Liquid Crystals Doped with CsPbBr3 Quantum Dots

Effects of CdTe Quantum Dot Dispersal on Current-Voltage Characteristics in Liquid Crystalline Mediums of E63, E7 and SCLP

Leveraging Hierarchical Chirality in Perovskite(‐Inspired) Halides for Transformative Device Applications

Contact Info

Product

Resources

About

Enhancement in electro-optical properties of ferroelectric liquid crystal by doping perovskite CsPbBr3 quantum dots

Cited by 11 publications

References 49 publications

Enhancement in Photoluminescence of Nematic Liquid Crystals Doped with CsPbBr3 Quantum Dots

Enhancement in Photoluminescence of Nematic Liquid Crystals Doped with CsPbBr3 Quantum Dots

Effects of CdTe Quantum Dot Dispersal on Current-Voltage Characteristics in Liquid Crystalline Mediums of E63, E7 and SCLP

Leveraging Hierarchical Chirality in Perovskite(‐Inspired) Halides for Transformative Device Applications

Contact Info

Product

Resources

About

Enhancement in electro-optical properties of ferroelectric liquid crystal by doping perovskite CsPbBr₃ quantum dots