Spectrally narrowed emissions from organic crystals mounted on transfer-printed parylene diffraction gratings

Abstract

We have fabricated diffraction gratings of parylene by evaporation polymerization. The parylene film was deposited onto a commercially available diffraction grating used as a template and transfer-printed onto a substrate. A well-defined periodic structure was replicated on the parylene film surface and its period was in good agreement with that of the template. For future light-emitting device application, we laminated a parylene grating with organic semiconductor crystals and investigated their emission properties under weak ultraviolet light excitation. We observed emissions parallel to the grating wave vector. Their spectra narrowed as peaks with full-widths at half-maxima less than 5 nm. We discussed these narrow emission lines considering them as the propagating light in a waveguide composed of the organic crystal and parylene grating. The present results reflect the formation of a high-quality optical cavity on a parylene film.

Organic crystal light-emitting transistors combined with a metal oxide layer

“…We fabricated the P6T crystal devices as follows. We deposited a 160-nm-thick poly(chloro-p-xylylene) (Parylene C) layer on the substrate surface 24) and peeled the part of it covering the patterned AZO layer. Then, we covered the AZO layer with the P6T crystal.…”

Direct fabrication of diffraction grating onto organic single crystals by electron beam lithography

“…This is due to the decrease in crystal thickness as seen in other TPCO crystals on a diffraction grating. 20,30,31) The SNE peak number decreased with decreasing crystal thickness in TPCO single crystals with diffraction gratings beneath 30,31) the crystals or on their surfaces. 20) As in our previous report, 20) we evaluated the diffraction order (m, natural number) and effective refractive index (n eff ) of the BP3T crystal.…”

“…In contrast, we assigned different m values to the plural peaks observed in one spectrum in our previous reports. 20,30,31) This is because the transverse mode was not considered. The quality (Q) factor of the DFB resonators, which was evaluated by dividing λ p by FWHM, was 221 for Sample 6 after etching (Table III).…”

Organic crystal light-emitting transistors with top-gate configuration

“…After removing the tungsten wire, we deposited an 800-or 1000-nm-thick poly(chloro-p-xylylene) (Parylene C ® ) layer on the substrate to cover the P6T crystal along with the electrodes. 31) For this, we put ∼0.9 g of p-xylylene dimer (DPX-C) in a Specialty Coating System Labcoter 2 Parylene deposition system. To complete the top-gate-type device, we deposited Ag (200 nm, ∼0.10 nm=s) on the parylene layer to cover the channel part of the device.…”