exciton emission
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RSC Advances ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 1035-1042
Author(s):  
Fang Pan ◽  
Jinrui Li ◽  
Xiaoman Ma ◽  
Yang Nie ◽  
Beichen Liu ◽  
...  

A broad STE emission band together with a FE emission was found at low temperature in a CsPbBr3 microcrystal sample prepared by CVD method.


2022 ◽  
Author(s):  
Kashyap Dave ◽  
Wen-Tse Huang ◽  
Tadeusz Leśniewski ◽  
Agata Lazarowska ◽  
Dawid Jankowski ◽  
...  

Here, we are reporting a halide precursors acid precipitation method to synthesize Cs2AgIn1–xBixCl6 (x = 0, 0.02, 0.04, 0.08, 0.16, 0.32, 0.64, and 1) microcrystals. Cs2AgInCl6 and Bi derivative double...


2021 ◽  
Author(s):  
Yalan Ma ◽  
Romana Alice Kalt ◽  
Andreas Stemmer

The excitonic luminescence of monolayer molybdenum disulfide (MoS2) on a gold substrate is studied by scanning tunneling microscopy (STM). STM-induced light emission (STM-LE) from MoS2 is assigned to the radiative decay of A and B excitons. The intensity ratio of A and B exciton emission can be modulated by the tunneling current, since the A exciton emission intensity saturates at high tunneling currents. Moreover, the corrugated gold substrate introduces local strain to the monolayer MoS2, resulting in significant changes of electronic bandgap and valence band splitting. The modulation rates of strain on A and B exciton energies are estimated as -72 meV/% and -57 meV/%, respectively. STM-LE provides a direct link between exciton energy and local strain in monolayer MoS2 with a spatial resolution <10 nm. 


2021 ◽  
Vol 122 ◽  
pp. 111654
Author(s):  
Mengqi Lin ◽  
Xizhen Zhang ◽  
Lizhu Guo ◽  
Yuhang Zhang ◽  
Ruixin Song ◽  
...  

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6699
Author(s):  
Shih-Ming Huang ◽  
Mu-Jen Lai ◽  
Rui-Sen Liu ◽  
Tsung-Yen Liu ◽  
Ray-Ming Lin

In this study, we suppressed the parasitic emission caused by electron overflow found in typical ultraviolet B (UVB) and ultraviolet C (UVC) light-emitting diodes (LEDs). The modulation of the p-layer structure and aluminum composition as well as a trade-off in the structure to ensure strain compensation allowed us to increase the p-AlGaN doping efficiency and hole numbers in the p-neutral region. This approach led to greater matching of the electron and hole numbers in the UVB and UVC emission quantum wells. Our UVB LED (sample A) exhibited clear exciton emission, with its peak near 306 nm, and a band-to-band emission at 303 nm. The relative intensity of the exciton emission of sample A decreased as a result of the thermal energy effect of the temperature increase. Nevertheless, sample A displayed its exciton emission at temperatures of up to 368 K. In contrast, our corresponding UVC LED (sample B) only exhibited a Gaussian peak emission at a wavelength of approximately 272 nm.


2021 ◽  
pp. 2101801
Author(s):  
Mahfujur Rahaman ◽  
Oleksandr Selyshchev ◽  
Yang Pan ◽  
Rico Schwartz ◽  
Ilya Milekhin ◽  
...  

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6654
Author(s):  
Weidong Zhang ◽  
Tyler A. Growden ◽  
Paul R. Berger ◽  
David F. Storm ◽  
David J. Meyer ◽  
...  

An electroluminescence (EL) phenomenon in unipolar-doped GaN/AlN/GaN double-barrier heterostructures—without any p-type contacts—was investigated from 4.2 K to 300 K. In the range of 200–300 K, the extracted peak photon energies agree with the Monemar formula. In the range of 30 to 200 K, the photon energies are consistent with A-exciton emission. At 4.2 K, the exciton type likely transforms into B-exciton. These studies confirm that the EL emission comes from a cross-bandgap (or band-to-band) electron-hole radiative recombination and is excitonic. The excitons are formed by the holes generated through interband tunneling and the electrons injected into the GaN emitter region of the GaN/AlN heterostructure devices.


2021 ◽  
Vol 21 (10) ◽  
pp. 5229-5234
Author(s):  
Jitao Li ◽  
Qiuxiang Zhu ◽  
Jinyang Ding ◽  
Guixia Zhang ◽  
Jiajia Han ◽  
...  

The response of graphene surface plasmon (SP) in ultraviolet (UV) wavelength region and its functional applications on the short wavelength of graphene/semiconductorare both fascinating research areas. Herein, a hybrid structure of graphene/GaN nanofilm was designed and fabricated to investigate the photoluminescence (PL) performance and the coupling dynamics. It is demonstrated that the resonant coupling between graphene SPs and GaN exciton emission is responsible for the substantially enhanced PL from the structure of graphene/GaN nanofilm. The underlying mechanism of the improved PL performance was proposed based on theoretical simulation and experimental characterization. The results are helpful to design new types of optic and photoelectronic devices based on SP coupling in graphene/semiconductor hybrid structures.


2021 ◽  
Vol 119 (13) ◽  
pp. 132105
Author(s):  
Takeyoshi Onuma ◽  
Wataru Kosaka ◽  
Kanta Kudo ◽  
Yuichi Ota ◽  
Tomohiro Yamaguchi ◽  
...  

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