Surface passivation assisted lasing emission in the quantum dots doped cholesteric liquid crystal resonating cavity with polymer template

Chen, Lin Jer; Lee, Chia Rong; Chu, Chung Liang

doi:10.1039/c4ra05787b

Cited by 13 publications

(11 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, CLCs are usually considered a 1D photonic crystal with an adjustable photonic bandgap (PBGs) via the temperature dependence of the pitch P. After doping the gain medium (e.g., dyes and QDs), the CLC helix acts as a resonator necessary for laser emission, which can be tuned by various external stimuli. Compared to conventional LC lasers, which are fabricated by dispersing laser dyes into CLCs, LC lasers based on QDs can lase emissions with improved features such as narrower line width, lower lasing threshold and low intensity to noise ratios, as well as high stability due to the 3D quantum confinement effect of QDs [131,[299][300][301] (Figure 11). On the other hand, amplified spontaneous emission (ASE) from colloids of QDs dispersed in LCs has also been investigated widely [301].…”

Section: Photonic Applicationsmentioning

confidence: 99%

See 1 more Smart Citation

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

2019

View full text Add to dashboard Cite

The research field of liquid crystals and their applications is recently changing from being largely focused on display applications and optical shutter elements in various fields, to quite novel and diverse applications in the area of nanotechnology and nanoscience. Functional nanoparticles have recently been used to a significant extent to modify the physical properties of liquid crystals by the addition of ferroelectric and magnetic particles of different shapes, such as arbitrary and spherical, rods, wires and discs. Also, particles influencing optical properties are increasingly popular, such as quantum dots, plasmonic, semiconductors and metamaterials. The self-organization of liquid crystals is exploited to order templates and orient nanoparticles. Similarly, nanoparticles such as rods, nanotubes and graphene oxide are shown to form lyotropic liquid crystal phases in the presence of isotropic host solvents. These effects lead to a wealth of novel applications, many of which will be reviewed in this publication. the observation of chirality from achiral molecules, resulting from sterically induced packing of the bent-core mesogens [10], such as ferroelectricity or the formation of helical superstructures in the B7 phase [14]. Thermotropic LCs are commonly constituted by single organic entities or mixtures thereof, which exhibit various mesophases at different temperatures or pressures [15], illustrated in Figure 1b. As the temperature rises, a typical thermotropic LC passes through higher ordered phases, also called soft crystals, the hexatic smectic phases with positional order as well as bond orientational order, through the fluid smectic phases (SmC and SmA), which exhibit both positional and orientational order, and finally to the nematic phase (N) with purely orientational order, into the isotropic phase. The number of different phases observed depends on the chemical composition, symmetry and order of the LC molecules. About 25 different thermotropic phases are known to date, and they are still increasing in number. Appl. Sci. 2019, 9, x FOR PEER REVIEW 2 of 47 unique effects of the observation of chirality from achiral molecules, resulting from sterically induced packing of the bent-core mesogens [10], such as ferroelectricity or the formation of helical superstructures in the B7 phase [14]. Thermotropic LCs are commonly constituted by single organic entities or mixtures thereof, which exhibit various mesophases at different temperatures or pressures [15], illustrated in Figure 1b. As the temperature rises, a typical thermotropic LC passes through higher ordered phases, also called soft crystals, the hexatic smectic phases with positional order as well as bond orientational order, through the fluid smectic phases (SmC and SmA), which exhibit both positional and orientational order, and finally to the nematic phase (N) with purely orientational order, into the isotropic phase. The number of different phases observed depends on the chemical composition, symmetry and order of the LC molecules. About...

show abstract

Section: Photonic Applicationsmentioning

confidence: 99%

“…The optical excitation and emission of these nanomaterials could be tuned effectively through the interaction between nanomaterials and the long-range ordered LC molecules, leading to a series of potential applications such as information storage, displays, LC lasers, etc. [130][131][132][133][134].…”

Section: Introductionmentioning

confidence: 99%

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

2019

View full text Add to dashboard Cite

show abstract

“…As an alternative to conventional organic dyes, some inorganic quantum dots (QDs) with relatively narrow emission bands and high brightness have been introduced to obtain wavelengthtunable CPL, thus avoiding emission quenching. [35][36][37][38][39][40][41] Despite these advantages, the main problem of embedding QDs into the LC medium is that it is hard to attain a high concentration of QDs while retaining the optical properties. Another problem is that QDs tend to aggregate inside the LCs.…”

Section: Communicationmentioning

confidence: 99%

Circularly Polarized Luminescence and a Reflective Photoluminescent Chiral Nematic Liquid Crystal Display Based on an Aggregation‐Induced Emission Luminogen

Zhao

et al. 2016

Advanced Optical Materials

145

View full text Add to dashboard Cite

“…We estimated the pitch as p = 0.43 lm by using the relation above and considering HTP = +6.67 lm À1 for the chiral dopant CB15. When the Ch-sample was sandwiched between two glass-slides as described above the planar texture (or Grandjen) was observed under POM at 24.1°C, this texture is quite stable [6][7][8][9] and we observed that the optical properties are still stable over more than one year. In Fig.…”

Section: Ch-lc Samplementioning

confidence: 76%

“…On the other hand, when the temperature increases, the springs are compressed and the reflected wavelengths are shorter (hypsochromic shift) [4,5]. Furthermore, these materials feature sufficient optical stability for many applications [6][7][8][9]. The main applications of chiral macrostructures include: bistable cholesteric reflective displays [10][11][12][13][14], optical filter for circularly polarized light in LCDs [15], electrically switchable mirrors [16], chiral pharmaceutical resolution [17], and photonic band gap materials [18,19].…”

Section: Introductionmentioning

confidence: 99%

Light polarization states of a cholesteric liquid crystal probed with optical ellipsometry

et al. 2015

View full text Add to dashboard Cite

Surface passivation assisted lasing emission in the quantum dots doped cholesteric liquid crystal resonating cavity with polymer template

Abstract: A copolymer has been used as a template for enhanced optical properties of core–shell CdS/ZnSe quantum dots doped cholesteric liquid crystal.

Cited by 13 publications

References 33 publications

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience

Circularly Polarized Luminescence and a Reflective Photoluminescent Chiral Nematic Liquid Crystal Display Based on an Aggregation‐Induced Emission Luminogen

Light polarization states of a cholesteric liquid crystal probed with optical ellipsometry

Contact Info

Product

Resources

About