We report random laser action in a system where optical amplification is provided by colloidal quantum dots (CQDs). This obtained depositing from solution CdSe/ZnS core-shell CQDs into rough micron-scale grooves fabricated on the surface of glass substrate. The combination CQD packing and disordered structures groove enables gain multiple scattering. Upon excitation, triggered above 25-mJ/cm2 threshold. Single-shot spectra were recorded to study emission spectral characteristics results show...

Mechanically flexible distributed feedback (DFB) lasers are fabricated by a low-cost approach using soft-lithography from holographic master grating. The gain material is star-shaped oligofluorene providing laser emission 425 to 442 nm with soft pump threshold at 14.4 μJ/cm (2.7 kW/cm). Encapsulation of the devices enables stable operation in ambient atmosphere 1/e degradation energy dosage 53 J/cm.

Abstract Optical pumping conditions for organic solid‐state lasers (OSLs) are discussed with particular emphasis on the use of gallium nitride based light‐emitting diodes (LEDs) as pump sources. LEDs operate in a regime where should be optimized short rise time and high peak intensity, whereas fall overall pulse duration less important. Lasers pumped this approach need to have very low thresholds which can now routinely created using (one‐dimensional) distributed feedback lasers. In case...

The transfer printing of 2 μm-thick aluminum indium gallium nitride (AlInGaN) micron-size light-emitting diodes with 150 nm (±14 nm) minimum spacing is reported. thin AlInGaN structures were assembled onto mechanically flexible polyethyleneterephthalate/polydimethylsiloxane substrates in a representative 16 × array format using modified dip-pen nano-patterning system. Devices the positioned pre-calculated set coordinates to demonstrate an automated process. Individual printed elements showed...

We report the transfer printing of blue-emitting micron-scale light-emitting diodes (micro-LEDs) onto fused silica and diamond substrates without use intermediary adhesion layers. A consistent Van der Waals bond was achieved via liquid capillary action, despite curvature LED membranes following release from their native silicon growth substrates. The excellence as a heat-spreader allowed printed membrane LEDs to achieve optical power output density 10 W/cm(2) when operated at current 254...

A fluorescence sensor with the capability for spatially multiplexed measurements utilizing smartphone detection is presented. Bioconjugated quantum dots are used as fluorescent tag and excited using a blue-emitting microLED (µLED). The 1-dimensional GaN µLED array butt-coupled to one edge of glass slide take advantage total internal reflection (TIRF) principles. bioassays on top surface waveguide resultant detected smartphone. red, green, blue channels digital image utilized spectrally...

We report on the steady-state and optical modulation characteristics of a luminescence down-converting colloidal quantum dot/polyimide nanocomposite system suitable for integration with gallium nitride optoelectronics. The approach provides solution-processable environmentally stable composite materials whose conversion intrinsic properties were evaluated at wavelengths from 535 to 624 nm. A white-light generation upon excitation mixing 450-nm light was also obtained by blending dots...

A mechanically flexible and wavelength-tunable laser with an ultra-thin glass membrane as substrate is demonstrated. The optically pumped hybrid device has a distributed feedback cavity that combines colloidal quantum dot gain film grating-patterned polymeric underlayer, all on 30-μm thick sheet. total thickness of the structure only 75 μm. average threshold fluence 450 ± 80 μJ/cm2 (for 5-ns excitation pulses) at emitting wavelength 607 nm. Mechanically bending thin-glass enables continuous...

ConspectusOne of the most desirable and advantageous attributes organic materials chemistry is ability to tune molecular structure achieve targeted physical properties. This can be performed specific values for ionization potential or electron affinity material, absorption emission characteristics, charge transport properties, phase behavior, solubility, processability, many other which in turn help push limits performance semiconductor devices. A striking example make subtle structural...

The rapid emergence of gallium-nitride (GaN) light-emitting diodes (LEDs) for solid-state lighting has created a timely opportunity optical communications using visible light. One important challenge to address this is extend the wavelength coverage GaN LEDs without compromising their modulation properties. Here, hybrid source emission at 540 nm consisting 450 micro-sized LED (micro-LED) with micron-thick ZnCdSe/ZnCdMgSe multi-quantum-well color-converting membrane reported....

Low-threshold, gain switched colloidal quantum dot (CQD) distributed-feedback lasers operating in the nanosecond regime are reported and proposed for sensing applications first time to authors' knowledge.The based on a mechanically-flexible polymeric, second order grating structure overcoated with thin-film of CQD/PMMA composite.The threshold fluence resulting is as low 0.5 mJ/cm 2 610 nm emission typical linewidth below 0.3 nm.The wavelength can be set at design stage laser operation...

This paper reports the utilization of colloidal semiconductor quantum dots as color converters for Gb/s visible light communications. We briefly review design and properties discuss them in context fast conversion InGaN sources, particular view effects self-absorption. is followed by a description CQD/polymer composite format converters. show samples such color-converting emitting at green, yellow/orange red wavelengths, combine these with blue-emitting microsize LED to form hybrid sources...

Two formats of multiwavelength red, green and blue (RGB) laser on mechanically-flexible glass are demonstrated.In both cases, three allorganic, vertically-emitting distributed feedback (DFB) lasers assembled onto a common ultra-thin membrane substrate fully encapsulated by thin polymer overlayer an additional 50µm-thick in order to improve the performance.The first device format has DFB sitting next each other substrate.The simultaneously excited single overlapping optical pump, emitting...

The first example of an all-organic oligofluorene truxene based distributed feedback laser for the detection a specific protein-small molecule interaction is reported. protein avidin was detected down to 1 μg mL(-1) using our biotin-labelled biosensor platform. This both selective and reversible when biotin replaced with desthiobiotin. Avidin not perturbed by Bovine Serum Albumin up 50,000 mL(-1). Our offers new platform that highly sensitive, modular potentially re-usable.

By fabricating a submicron-scale grating structure on bendable polymer substrate, we demonstrate flexible distributed-feedback colloidal quantum dot laser. This laser uses cadmium selenide/zinc sulfide core-shell nanostructures, operating in transverse electric polarized multiple-modes, and has typical threshold pump fluence of ∼4 mJ/cm2.

A frequency up-converted laser using star-shaped oligomers based on the truxene-core is demonstrated with an ultra-low threshold of 3.1 mJ cm⁻².

Visible light communications (VLC) is an emerging technology that uses LEDs, such as found in lighting fixtures and displays, to transmit data wirelessly. Research has so far focused on LED transmitters photoreceivers separate, discrete components. Combining both types of devices into a single transceiver format will enable bi-directional VLC offer flexibility for the development future advanced systems. Here, proof concept integrated optical demonstrated by transfer printing microsize LED,...

Two formats of all-organic distributed-feedback lasers with improved photostability, respectively called nanocomposite and encapsulated lasers, are reported.These compatible mechanically-flexible platforms were entirely fabricated using softlithography spin-coating techniques.The gain elements in both types monodisperse π-conjugated star-shaped macromolecules (oligofluorene truxene, T3).In the nanocomposites these incorporated into a transparent polyimide matrix, while devices neat layer T3...

A diode-pumped, mechanically-flexible organic distributed-feedback laser that is fully encapsulated with ultra-thin glass reported. The excited by 450 nm diode and emits at 537 an oscillation threshold of 290 W/cm². encapsulation format the device results in a photostability improved two orders magnitude compared to non-encapsulated reference while maintaining mechanical flexibility thanks overall thickness below 105 µm. also wavelength-tunable between 535 545 bending structure.

Supraparticle (SP) microlasers fabricated by the self-assembly of colloidal nanocrystals have great potential as coherent optical sources for integrated photonics. However, their deterministic placement integration with other photonic elements remains an unsolved challenge. In this work, we demonstrate manipulation and printing individual SP microlasers, laying foundation use in more complex circuits. We fabricate CdSxSe1-x/ZnS quantum dot (CQD) SPs diameters from 4 to 20 μm Q-factors...

We report a 1.055-mum microchip VECSEL array which uses microlens-patterned diamond both as heatspreader and an of concave output mirrors. This configuration, is suitable for laser operation, here exploited to perform systematic study set lasers with the same semiconductor structure but different cavity properties. The transverse mode selection individual VECSELs found depend on mode-matching conditions microlens aperture size. Mode-matched single-device emission in fundamental (M2~1.1)...

A light-emitting photoresist comprising a vinyl-ether-based photosensitive polymer host doped with star-shaped π-conjugated truxene–core oligomers is shown to be promising platform for the realization of soft-matter photonic devices. In particular, simple process fabrication free-standing membranes no spin casting and peel-off steps reported. The approach uses instead hydrophobic nature nanocomposites. Membranes are fabricated, concentration 20 mg ml − 1 truxene oligomer denoted as T3,...

We report on the continuous-wave amplification characteristics of an optically pumped 1.3-/spl mu/m multiple-quantum-well GaInNAs-GaAs vertical-cavity semiconductor optical amplifier (VCSOA). The VCSOA structure was monolithically grown by molecular beam epitaxy and operated in reflection mode a fiber-coupled system. maximum on-chip gain attained, limited onset laser action, 15.6 dB at 196 mW 980-nm pump power. For chip 10.4 dB, bandwidth 10.8 GHz saturation output power -9 dBm. By varying...