[9a-PA6-1~7] 4.3 Laser sources and Laser applications

英語発表

[9a-PA6-1] Amplified Spontaneous Emission of Flexible Quasi-2D Perovskite Films under Mechanical Bending

〇Ja-Hon Lin¹, Zhe-Wei Fan¹, Hsin-Yi Wei¹, Zhi-Xiang Chang¹ (1.Natl. Taipei Univ. of Tech.)

キーワード：

quasi-2D perovskite、amplified spontaneous emission、flexible PET

Here, we demonstrate amplified spontaneous emission (ASE) from a solution processed quasi-2D perovskite (PVSK )film, PEA₂Cs_n−1Pb_nBr_3n+1, deposited on a flexible polyethylene terephthalate (PET) substrate and investigate its emission behavior under mechanical bending. The absorption spectrum of the quasi-2D PVSK film showed several characteristic absorption peaks corresponding to low-n phases (n=1 to n≥4), while the photoluminescence (PL) spectrum exhibited a dominant emission peak at 515.6 nm. Under Q-switched pulsed-laser excitation, a pronounced ASE peak around 533 nm was emerged on top of broad spontaneous emission as pump fluence above threshold around 23.8 mJ/cm². As the curvature of the quasi-2D PVSK film increased from 0 cm^-1 to +1.33 cm^-1, the ASE intensity increased significantly, while the emission wavelength remained nearly unchanged. The enhanced ASE performance is attributed to increased optical scattering and improved optical confinement induced by mechanical bending. These results demonstrate the excellent optical stability of flexible quasi-2D PVSK films and highlight their potential for future flexible photonic and laser applications