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Shape-engineering of self-assembled organic single microcrystal as optical microresonator for laser applications.

Wang X, Liao Q, Lu X, Li H, Xu Z, Fu H - Sci Rep (2014)

Bottom Line: Furthermore, these as-prepared microcrystals demonstrate shape-dependent microresonator properties that 1D microwires act as Fabry-Pérot (FP) mode lasing resonator and 2D microdisks provide the whispering-gallery-mode (WGM) resonator for lasing oscillator.More significantly, through the investigation of the size-effect on the laser performance, single-mode lasing at red wavelength was successfully achieved in the self-assembled 2D organic microdisk at room temperature.These easily fabricated organic single-crystalline microcrystals with controlled shapes are the natural laser sources, which offer considerable promise for the multi-functionalities of coherent light devices integrated on the optics microchip.

View Article: PubMed Central - PubMed

Affiliation: 1] Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China [2] Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China.

ABSTRACT
Single micro/nanocrystals based on π-conjugated organic molecules have caused tremendous interests in the optoelectronic applications in laser, optical waveguide, nonlinear optics, and field effect transistors. However, the controlled synthesis of these organic micro/nanocrystals with regular shapes is very difficult to achieve, because the weak interaction (van der Waals' force, ca. 5 kJ/mol) between organic molecules could not dominate the kinetic process of crystal growth. Herein, we develop an elaborate strategy, selective adhesion to organic crystal plane by the hydrogen-bonding interaction (ca. 40 kJ/mol), for modulating the kinetic process of the formation of microcrystal, which leads to the self-assembly of one organic molecule 3-[4-(dimethylamino)phenyl]-1-(2-hy-droxyphenyl)prop-2-en-1-on (HDMAC) into one-dimensional (1D) microwires and 2D microdisks respectively. Furthermore, these as-prepared microcrystals demonstrate shape-dependent microresonator properties that 1D microwires act as Fabry-Pérot (FP) mode lasing resonator and 2D microdisks provide the whispering-gallery-mode (WGM) resonator for lasing oscillator. More significantly, through the investigation of the size-effect on the laser performance, single-mode lasing at red wavelength was successfully achieved in the self-assembled 2D organic microdisk at room temperature. These easily fabricated organic single-crystalline microcrystals with controlled shapes are the natural laser sources, which offer considerable promise for the multi-functionalities of coherent light devices integrated on the optics microchip.

No MeSH data available.


Related in: MedlinePlus

Self-assembly of one organic molecule HDMAC into 1D microwires and 2D microdisks.(a) The predicted growth morphology of HDMAC molecules based on the attachment energies. (b) and (c) SEM images of as-prepared HDMAC 1D microwires and 2D microdisks, respectively. (d) and (e) Photoluminescence (PL) microscopy images of the as-prepared 1D microwires and 2D microdisks excited with UV band (330–380 nm) from a mercury lamp.
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f1: Self-assembly of one organic molecule HDMAC into 1D microwires and 2D microdisks.(a) The predicted growth morphology of HDMAC molecules based on the attachment energies. (b) and (c) SEM images of as-prepared HDMAC 1D microwires and 2D microdisks, respectively. (d) and (e) Photoluminescence (PL) microscopy images of the as-prepared 1D microwires and 2D microdisks excited with UV band (330–380 nm) from a mercury lamp.

Mentions: We firstly simulated the growth shape of HDMAC crystal based on attachment energies using Materials Studio package40. From the simulation results, the growth morphology of HDMAC molecules is predicted as 2D disk-like structure, as shown in Fig. 1a. In our experiments, a facile solution drop-drying method was applied to fabricate the microstructures of small organic molecule 3-[4-(dimethylamino)phenyl]-1-(2-hy-droxyphenyl)prop-2-en-1-one (HDMAC). In a typical synthesis, HDMAC was completely dissolved in solvent at room temperature, and then the solution was dropped onto the quartz substrate. With the solvents evaporating, microcrystals were obtained finally. Interestingly, we found that the shape of as-prepared microcrystals depends sensitively on different solvents: protic solvents and aprotic solvents. That is: one-dimensional HDMAC microwires (1D-MWs) were obtained by choosing the protic solvents such as C2H5OH, CH3OH, and i-C3H7OH; Meanwhile the 2D HDMAC microdisks (2D-MDs) were prepared by choosing the aprotic solvents such as CH2Cl2, CHCl3, n-C6H14, and CS2. Figure 1b shows a typical scanning electron microscopy (SEM) image of the as-prepared HDMAC 1D-MWs with regular shapes. SEM and atomic force microscope (AFM) measurements of these as-prepared 1D-MWs disclosed that the 1D-MWs have the length (l) of 10 ~ 30 μm, the width (w) around 1 μm, and the height (h) around 500 nm (Supplementary Fig. S1a). Meanwhile Figure 1c presents the SEM image of as-prepared HDMAC 2D-MDs, which has regular rectangular shapes and smooth faces. Combined with the AFM measurements together (Supplementary Fig. S1b), these 2D-MDs have the edge width (w1 or w2) ranging from 2 μm to 10 μm, and the average height (h) of 600 nm. Based on the above structure-characterizations of these two kinds of the as-prepared microcrystals, it is concluded that the self-assembled 1D-MWs and 2D-MDs could be prepared respectively by just adjusting the kinds of solvents (protic solvents and aprotic solvents) in the process of crystal growth.


Shape-engineering of self-assembled organic single microcrystal as optical microresonator for laser applications.

Wang X, Liao Q, Lu X, Li H, Xu Z, Fu H - Sci Rep (2014)

Self-assembly of one organic molecule HDMAC into 1D microwires and 2D microdisks.(a) The predicted growth morphology of HDMAC molecules based on the attachment energies. (b) and (c) SEM images of as-prepared HDMAC 1D microwires and 2D microdisks, respectively. (d) and (e) Photoluminescence (PL) microscopy images of the as-prepared 1D microwires and 2D microdisks excited with UV band (330–380 nm) from a mercury lamp.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4228325&req=5

f1: Self-assembly of one organic molecule HDMAC into 1D microwires and 2D microdisks.(a) The predicted growth morphology of HDMAC molecules based on the attachment energies. (b) and (c) SEM images of as-prepared HDMAC 1D microwires and 2D microdisks, respectively. (d) and (e) Photoluminescence (PL) microscopy images of the as-prepared 1D microwires and 2D microdisks excited with UV band (330–380 nm) from a mercury lamp.
Mentions: We firstly simulated the growth shape of HDMAC crystal based on attachment energies using Materials Studio package40. From the simulation results, the growth morphology of HDMAC molecules is predicted as 2D disk-like structure, as shown in Fig. 1a. In our experiments, a facile solution drop-drying method was applied to fabricate the microstructures of small organic molecule 3-[4-(dimethylamino)phenyl]-1-(2-hy-droxyphenyl)prop-2-en-1-one (HDMAC). In a typical synthesis, HDMAC was completely dissolved in solvent at room temperature, and then the solution was dropped onto the quartz substrate. With the solvents evaporating, microcrystals were obtained finally. Interestingly, we found that the shape of as-prepared microcrystals depends sensitively on different solvents: protic solvents and aprotic solvents. That is: one-dimensional HDMAC microwires (1D-MWs) were obtained by choosing the protic solvents such as C2H5OH, CH3OH, and i-C3H7OH; Meanwhile the 2D HDMAC microdisks (2D-MDs) were prepared by choosing the aprotic solvents such as CH2Cl2, CHCl3, n-C6H14, and CS2. Figure 1b shows a typical scanning electron microscopy (SEM) image of the as-prepared HDMAC 1D-MWs with regular shapes. SEM and atomic force microscope (AFM) measurements of these as-prepared 1D-MWs disclosed that the 1D-MWs have the length (l) of 10 ~ 30 μm, the width (w) around 1 μm, and the height (h) around 500 nm (Supplementary Fig. S1a). Meanwhile Figure 1c presents the SEM image of as-prepared HDMAC 2D-MDs, which has regular rectangular shapes and smooth faces. Combined with the AFM measurements together (Supplementary Fig. S1b), these 2D-MDs have the edge width (w1 or w2) ranging from 2 μm to 10 μm, and the average height (h) of 600 nm. Based on the above structure-characterizations of these two kinds of the as-prepared microcrystals, it is concluded that the self-assembled 1D-MWs and 2D-MDs could be prepared respectively by just adjusting the kinds of solvents (protic solvents and aprotic solvents) in the process of crystal growth.

Bottom Line: Furthermore, these as-prepared microcrystals demonstrate shape-dependent microresonator properties that 1D microwires act as Fabry-Pérot (FP) mode lasing resonator and 2D microdisks provide the whispering-gallery-mode (WGM) resonator for lasing oscillator.More significantly, through the investigation of the size-effect on the laser performance, single-mode lasing at red wavelength was successfully achieved in the self-assembled 2D organic microdisk at room temperature.These easily fabricated organic single-crystalline microcrystals with controlled shapes are the natural laser sources, which offer considerable promise for the multi-functionalities of coherent light devices integrated on the optics microchip.

View Article: PubMed Central - PubMed

Affiliation: 1] Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China [2] Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China.

ABSTRACT
Single micro/nanocrystals based on π-conjugated organic molecules have caused tremendous interests in the optoelectronic applications in laser, optical waveguide, nonlinear optics, and field effect transistors. However, the controlled synthesis of these organic micro/nanocrystals with regular shapes is very difficult to achieve, because the weak interaction (van der Waals' force, ca. 5 kJ/mol) between organic molecules could not dominate the kinetic process of crystal growth. Herein, we develop an elaborate strategy, selective adhesion to organic crystal plane by the hydrogen-bonding interaction (ca. 40 kJ/mol), for modulating the kinetic process of the formation of microcrystal, which leads to the self-assembly of one organic molecule 3-[4-(dimethylamino)phenyl]-1-(2-hy-droxyphenyl)prop-2-en-1-on (HDMAC) into one-dimensional (1D) microwires and 2D microdisks respectively. Furthermore, these as-prepared microcrystals demonstrate shape-dependent microresonator properties that 1D microwires act as Fabry-Pérot (FP) mode lasing resonator and 2D microdisks provide the whispering-gallery-mode (WGM) resonator for lasing oscillator. More significantly, through the investigation of the size-effect on the laser performance, single-mode lasing at red wavelength was successfully achieved in the self-assembled 2D organic microdisk at room temperature. These easily fabricated organic single-crystalline microcrystals with controlled shapes are the natural laser sources, which offer considerable promise for the multi-functionalities of coherent light devices integrated on the optics microchip.

No MeSH data available.


Related in: MedlinePlus