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23 results on '"De, Jianbo"'

2. A room-temperature electrical-field-enhanced ultrafast switch in organic microcavity polariton condensates

Author

De, Jianbo, Ma, Xuekai, Yin, Fan, Ren, Jiahuan, Yao, Jiannian, Schumacher, Stefan, Liao, Qing, Fu, Hongbing, Malpuech, Guillaume, and Solnyshkov, Dmitry

Subjects
Physics - Optics, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Quantum Gases
Abstract

Integrated electro-optical switches are essential as one of the fundamental elements in the development of modern optoelectronics. As an architecture for photonic systems, exciton polaritons, that are hybrid bosonic quasiparticles that possess unique properties derived from both excitons and photons, have shown much promise. For this system, we demonstrate a significant improvement of emitted intensity and condensation threshold by applying an electric field to a microcavity filled with an organic microbelt. Our theoretical investigations indicate that the electric field makes the excitons dipolar and induces an enhancement of the exciton-polariton interaction and of the polariton lifetime. Based on these electric field induced changes, a sub-nanosecond electrical-field-enhanced polariton condensate switch is realized at room temperature, providing the basis for developing an on-chip integrated photonic device in the strong light-matter coupling regime.

Published
2022

3. Circularly polarized electroluminescence from a single-crystal organic microcavity light-emitting diode based on photonic spin-orbit interactions

Author

Jia, Jichao, Cao, Xue, Ma, Xuekai, De, Jianbo, Yao, Jiannian, Schumacher, Stefan, Liao, Qing, and Fu, Hongbing

Subjects
Physics - Optics, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Circularly polarized (CP) electroluminescence from organic light-emitting diodes (OLEDs) has aroused considerable attention for their potential in future display and photonic technologies. The development of CP-OLEDs relies largely on chiral-emitters, which not only remain rare owing to difficulties in design and synthesis but also limit the performance of electroluminescence. When the polarization (pseudospin) degrees of freedom of a photon interact with its orbital angular momentum, photonic spin-orbit interaction (SOI) emerges such as Rashba-Dresselhaus (RD) effect. Here, we demonstrate a chiral-emitter-free microcavity CP-OLED with a high dissymmetry factor (gEL) and high luminance by embedding a thin two-dimensional organic single crystal (2D-OSC) between two silver layers which serve as two metallic mirrors forming a microcavity and meanwhile also as two electrodes in an OLED architecture. In the presence of the RD effect, the SOIs in the birefringent 2D-OSC microcavity result in a controllable spin-splitting with CP dispersions. Thanks to the high emission efficiency and high carrier mobility of the OSC, chiral-emitter-free CP-OLEDs have been demonstrated exhibiting a high gEL of 1.1 and a maximum luminance of about 60000 cd/m2, which places our device among the best performing CP-OLEDs. This strategy opens a new avenue for practical applications towards on-chip microcavity CP-OLEDs.

Published
2022
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8. Molecular Orientation‐Induced Polarization Filtering based on Organic Heterostructures.

Author

Liu, Kun, De, Jianbo, Liang, Qian, Liao, Qing, and Fu, Hongbing

Subjects
*OPTICAL polarizers, *NANOWIRES, *HETEROSTRUCTURES, *ORGANIC bases, *LIGHT propagation, *EPITAXY
Abstract

Demonstration of efficient polarization‐signal filtering induced by molecular orientation in organic heterostructures remains elusive. Herein, an epitaxial growth technology is developed for blue‐emissive horizontal p‐distyrylbenzene (DSB) nanosheet (NS) arrays on 9,10‐dicyanoanthracene (DCA)‐dominated (DCA)1‐x(DSB)x doped nanowire (NW) backbone via a facile stepwise solution‐processed method. It is shown that the DSB NS arrays generate blue amplified spontaneous emission (ASE), whereas the backbone of the (DCA)1‐x(DSB)x displays intense yellow emission. Surprisingly, the blue ASE can effectively propagate in (DCA)1‐x(DSB)x backbone immunity to DCA absorption and realize polarization filtering of output ASE. The mechanism of the orthogonal polarization between blue‐ASE from branches and absorption of DCA molecules in the backbone is responsible for the efficient transport of higher‐energy photons in narrow‐gap emitters. This molecular orientation‐induced polarized‐light transport can serve to control light propagation and function as polarization filter in a single heterostructure. The research provides an interesting example for the exploration of novel all‐optical switch devices in photonic circuits. [ABSTRACT FROM AUTHOR]

Published
2023
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17. High Mobility Organic Lasing Semiconductor with Crystallization‐Enhanced Emission for Light‐Emitting Transistors

Author

Liu, Dan, primary, Liao, Qing, additional, Peng, Qian, additional, Gao, Haikuo, additional, Sun, Qi, additional, De, Jianbo, additional, Gao, Can, additional, Miao, Zhagen, additional, Qin, Zhengsheng, additional, Yang, Jiaxin, additional, Fu, Hongbing, additional, Shuai, Zhigang, additional, Dong, Huanli, additional, and Hu, Wenping, additional

Published
2021
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20. Organic Laser Molecule with High Mobility, High Photoluminescence Quantum Yield, and Deep-Blue Lasing Characteristics

Author

Liu, Dan, primary, De, Jianbo, additional, Gao, Haikuo, additional, Ma, Suqian, additional, Ou, Qi, additional, Li, Shuai, additional, Qin, Zhengsheng, additional, Dong, Huanli, additional, Liao, Qing, additional, Xu, Bin, additional, Peng, Qian, additional, Shuai, Zhigang, additional, Tian, Wenjing, additional, Fu, Hongbing, additional, Zhang, Xiaotao, additional, Zhen, Yonggang, additional, and Hu, Wenping, additional

Published
2020
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23. Directional Laser from Solution-Grown Grating-Patterned Perovskite Single-Crystal Microdisks.

Author

Zhang Z, Vogelbacher F, De J, Wang Y, Liao Q, Tian Y, Song Y, and Li M

Abstract

Solution-processed, high-gain, and wavelength-tunable perovskite single-crystal microdisk (PVKsc-MD) lasers have emerged as prospective coherent light sources in advanced nanophotonic designs. However, the inevitable multi-directional emission from a highly symmetrical cavity leads to low light collection efficiency which greatly hinders its application in integrated optical circuits. Here, we report on surface-patterned MAPbBr 3 PVKsc-MDs synthesized by a cost-efficient bottom-up solution process employing spin-coating and confined-growth nanoimprinting. The patterned microdisks have high crystal quality with regular shape and sharp edges and nano-grating structure on the upper surface. This straightforward process yields surface-patterned PVKsc-MD lasers with a low lasing threshold and high quality (Q) factor. In addition, the grating structure patterned on the PVKsc-MDs reduces the original symmetry of the laser cavity, which improves the emission directionality four times., (© 2022 Wiley-VCH GmbH.)

Published
2022
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