Tunable nonlinear optical responses based on host-guest MOF hybrid materials
- PDF / 2,335,166 Bytes
- 8 Pages / 595.276 x 793.701 pts Page_size
- 95 Downloads / 139 Views
Published online 14 October 2020 | https://doi.org/10.1007/s40843-020-1455-6
Tunable nonlinear optical responses based on hostguest MOF hybrid materials †
†
*
Hongjun Li , Lin Zhang , Huajun He, Yu Yang, Yuanjing Cui and Guodong Qian ABSTRACT The realization of tunable nonlinear optical (NLO) responses in a single nano-/micro-structure is extremely important. However, in lack of effective ways to integrate multiple performances, it still faces severe limitations during applications. Herein, we demonstrate a wavelengthdependent NLO micro-structure based on host-guest metalorganic framework (MOF) materials through encapsulating linear dye molecules into periodic one-dimensional (1D) channels. The confinement to non-centrosymmetric polar dye molecules enhances the second-/third-order NLO responses of the hybrid crystals, causing obvious two-photon luminescence (TPL), second harmonic generation (SHG) and third harmonic generation (THG) responses in the as-prepared composites. The highly ordered structures of MOFs impart spatial regulation on the linear dye molecules to realize orientation alignment, resulting in the polarized anisotropy emission. NIR-to-NIR (NIR, near-infrared region) two-photon pumped lasing is realized with the natural whispering gallery mode resonance cavities of MOFs under the excitation of a 1200-nm fs laser. Furthermore, tunable NLO properties such as TPL, SHG and THG are achieved through switching the incident excitation wavelength from 800 to 1500 nm. Such hybrid materials with tunable NLO responses may open a new avenue toward designing multifunctional NLO devices in the future. Keywords: nonlinear optical response, metal-organic frameworks, second harmonic generation, two-photon luminescence
INTRODUCTION Nonlinear optical (NLO) nano-/micro-structure materials are extremely important to materials science communities due to their extensive applications. NLO materials with specific responses are designed and constructed for
the targeted application scenarios including information communication, optoelectronics, bio-photonics, and the like [1–3]. Up to now, NLO behaviors especially twophoton luminescence (TPL), second harmonic generation (SHG) and third harmonic generation (THG) have been systematically studied in numerous materials in order to develop various miniature devices [4–6]. Generally, for a certain material, the NLO behavior is specific and unique, which can hardly fulfill the further need for developing multifunctional integrated devices. In this concern, novel materials with multiple NLO properties are highly expected to be explored [7–9]. On the other hand, one single crystal with tunable NLO behaviors seems to be advantageous for integrating and controlling multiple NLO expressions by switching parametric conditions such as excitation wavelength, indicating a simple and effective approach to the aim of multiple NLO properties [10,11]. Unfortunately, in lack of appropriate construction strategies to integrate multiple NLO responses in a single device, it is still challenging t
Data Loading...
