Chen, Chen Chen, Feng Chen, Xiaolong Deng, Bingchen Eng, Brendan Jung, Daehwan Guo, Qiushi Yuan, Shaofan Watanabe, Kenji Taniguchi, Takashi Lee, Minjoo L. Xia, Fengnian 2024-01-19T20:33:19Z 2024-01-19T20:33:19Z 2021-09-02 2019-03 1530-6984 https://pubs.kist.re.kr/handle/201004/120285 Recently rediscovered layered black phosphoms (BP) provides rich opportunities for investigations of device physics and applications. The band gap of BP is widely tunable by its layer number and a vertical electric field, covering a wide electromagnetic spectral range from visible to mid-infrared. Despite much progress in BP optoelectronics, the fundamental photoluminescence (PL) properties of thin-film BP in mid-infrared have rarely been investigated. Here, we report bright PL emission from thin-film BP (with thickness of 4.5 to 46 nm) from 80 to 300 K. The PL measurements indicate a band gap of 0.308 +/- 0.003 eV in 46 nm thick BP at 80 K, and it increases monotonically to 0.334 +/- 0.003 eV at 300 K. Such an anomalous blueshift agrees with the previous theoretical and photoconductivity spectroscopy results. However, the observed blueshift of 26 meV from 80 to 300 K is about 60% of the previously reported value. Most importantly, we show that the PL emission intensity from thin-film BP is only a few times weaker than that of an indium arsenide (InAs) multiple quantum well (MQW) structure grown by molecular beam epitaxy. Finally, we report the thickness-dependent PL spectra in thin-film BP in mid-infrared regime. Our work reveals the mid-infrared light emission properties of thin-film BP, suggesting its promising future in tunable mid-infrared light emitting and lasing applications. English AMER CHEMICAL SOC TEMPERATURE-DEPENDENCE BAND-GAP PHOTODETECTOR SEMICONDUCTOR ORIENTATION STRAIN STATE Bright Mid-Infrared Photoluminescence from Thin-Film Black Phosphorus Article 10.1021/acs.nanolett.8b04041 1 NANO LETTERS, v.19, no.3, pp.1488 - 1493 NANO LETTERS 19 3 1488 1493 scie scopus 000461537600010 2-s2.0-85062349250 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article TEMPERATURE-DEPENDENCE BAND-GAP PHOTODETECTOR SEMICONDUCTOR ORIENTATION STRAIN STATE Black phosphorus photoluminescence tunability band gap mid-infrared anomalous blueshift