Distributed Feedback Lasers Based on Thiophene/Phenylene Co‐Oligomer Single Crystals

Abstract

Organic crystals have great potential for the applications in laser devices. This article presents an effective approach for fabrication of distributed feedback single crystal lasers. With the laser interference ablation method, high quality grating structures have been fabricated on the organic single‐crystalline thin film materials. The relationship between the depth, periodicity, and laser fluence is discussed. The optical properties, such as photoluminescence, and diffractive properties are studied in detail. With the appropriate period, strong laser emission has been observed from these devices. Distributed feedback lasing is demonstrated from the laser interference ablated organic single crystals for the first time.

Organic Single-Crystal Light-Emitting Transistor Coupling with Optical Feedback Resonators

“…Within this framework, several efforts have been made to construct a resonator for organic single crystals. Among of the examples were the use of a naturally-formed cleaved facet as a Fabry-Perot resonator202122, microcavities fabricated using electron-beam lithography (EBL) and reactive ion etching (RIE)232425, as well as distributed-feedback cavities prepared using laser ablation method26. As grown single crystals containing natural Fabry-Perot resonator were typically very small in size, and SCLETs fabrication using these crystals was difficult.…”

Preparation and time-resolved fluorescence study of RGB organic crystals

“…For producing reliable high-quality devices, the preferred organic semiconductor must be well ordered and stable with closely-packed molecules having few defects between molecules or domains. The long-range order presented in thin films of crystalline organic semiconductors results in high charge carrier mobility and some of the crystals exhibit high luminescence efficiency making them superior in electronic and optical performance [8,[10][11][12][13][14][15][16][17][18][19]. Enormous recent efforts have brought significant progresses in the growth of organic single crystals, the fabrication of single crystal devices and the investigation of structure-properties relationship of organic semiconductors based on the crystals [8,11,16,[19][20][21][22][23][24][25][26][27].…”

“…Conceptually, organic materials allow chemical engineering of electronic and photonic properties by molecular design, taking advantage of low cost, flexibility and low temperature processing [5][6][7][8][9]. Organic optoelectronic thin films exhibit high sensitivity to electrical and optical stimulus and can realize light-emitting diode (OLED) and other extremely promise applications, such as transistors, photovoltaics and compact laser systems [10][11][12][13][14]. For producing reliable high-quality devices, the preferred organic semiconductor must be well ordered and stable with closely-packed molecules having few defects between molecules or domains.…”

Thermal-nanoimprint lithography for perylenediimide-based distributed feedback laser fabrication

“…In some of them, relief gratings have been prepared over the substrate by holographic lithography [5,6], electron beam lithography (EBL) [7,8], laser interference lithography [8] or nanoimprint lithography (NIL) [9][10][11], and then the active film was deposited on top of them by spincasting [5], spin-coating [6,7,[9][10][11] or horizontal-dipping coating [8]. In other works direct patterning of the DFB structure on the active medium by UV laser interference ablation [12], two photon polymerization [13], or NIL [7,[14][15][16] processes have been performed. Among all these fabrication methods, NIL is one of the most promising technologies due to its high throughput, low-cost and high fidelity pattern transfer [17,18].…”