Lasers, LEDs and light sources articles within Nature Communications

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  • Article
    | Open Access

    Here the authors demonstrate a laser system that can directly output soliton microcombs, with high power efficiency and reconfigurability, paving the way for communication, computing, and metrology based on integrated photonics.

    • Jingwei Ling
    • , Zhengdong Gao
    •  & Qiang Lin

  • Article
    | Open Access

    Efficient organic light-emitting diodes require a multilayer architecture to confine charge recombination to the emissive layer. Here, authors demonstrate efficient single-layer devices for emitters with imbalanced charge transport without the need of additional charge transport or blocking layers.

    • Xiao Tan
    • , Dehai Dou
    •  & Gert-Jan A. H. Wetzelaer

  • Article
    | Open Access

    The laser pulses that drive most laser wakefield accelerators have wavelengths near 1 micrometer and peak power > 100 terawatts. Here, the authors drive plasma wakes with 10 micrometer, 2-terawatt pulses, yielding relativistic electron beams with a collimated, narrow-energy-bandwidth component.

    • R. Zgadzaj
    • , J. Welch
    •  & M. C. Downer

  • Article
    | Open Access

    Photonic time crystal refers to a material whose dielectric properties oscillate in time. Here the authors theoretically show such behaviour in the excitonic insulator candidate Ta2NiSe5 under optical excitation and use it to explain the enhanced THz reflectivity recently observed in pump-probe experiments

    • Marios H. Michael
    • , Sheikh Rubaiat Ul Haque
    •  & Eugene Demler

  • Article
    | Open Access

    Conventional lighting requires an AC-DC converter for LEDs. Here, the authors report a tandem structure by connecting two QLEDs with opposite polarity in parallel, enabling AC driven operation. A household AC electricity plug-and-play QLEDs panel with tuneable colour and brightness is achieved.

    • Jiming Wang
    • , Cuixia Yuan
    •  & Shuming Chen

  • Article
    | Open Access

    Shi et al. report the synthesis of multicolour thermally activated delayed fluorescent carbon dots with 3D onion-like configuration to stabilise the triplet state and reduce the singlet-triplet energy gap. LEDs with EQE of 6.0–9.9% are achieved, a step further for efficient and stable displays.

    • Yuxin Shi
    • , Yang Zhang
    •  & Louzhen Fan

  • Article
    | Open Access

    It has been challenging to realize efficient and stable blue phosphorescent organic light-emitting diodes. Here, authors explore the effect of substitution position in platinum(II) dopants with suppressed metal-metal-to-ligand charge transfer features, resulting in prolonged lifetime in the devices.

    • Young Hun Jung
    • , Gyeong Seok Lee
    •  & Jang Hyuk Kwon

  • Article
    | Open Access

    The realization of a BT.2020 blue emitter is challenging due to the spectral redshift associated with π-extension. Here, the authors report a multi-resonance thermally activated delayed fluorescence emitter, exhibiting ultrapure deep-blue narrow emission and CIEy ≤ 0.05 exceeding 20% efficiency.

    • Junki Ochi
    • , Yuki Yamasaki
    •  & Takuji Hatakeyama

  • Article
    | Open Access

    Compact sources in the frequency range of 6-12 THz are difficult to obtain due to optical phonon absorption in conventional III-V semiconductors. Here, the authors demonstrate third harmonic generation at 9.63 THz by optically pumping monolayer graphene coupled to a circular split ring resonator by using a semiconductor laser.

    • Alessandra Di Gaspare
    • , Chao Song
    •  & Miriam S. Vitiello

  • Comment
    | Open Access

    I argue that a surface emitting laser that remains single mode irrespective of its size, a scale-invariant laser, should of necessity also waste light at the edge. This is a fundamental departure from the Schawlow-Townes two-mirror strategy that keeps light away from mirrors and edges to preserve gain and minimize loss. The strategy was implemented in the recent discovery of the Berkeley Surface Emitting Laser (BerkSEL).

    • Boubacar Kanté

  • Article
    | Open Access

    The authors present a switchable dual colour orthogonal linear polarized OLED by internally integrating a nanograting for selective diffraction of optical modes, which is appealing for applications including polarisation-encrypted colourful optical images and autostereoscopic naked-eye 3D displays.

    • Ruixiang Chen
    • , Ningning Liang
    •  & Tianrui Zhai

  • Article
    | Open Access

    The authors showcase an innovative anti-reflective vertical-cavity surface-emitting laser (AR-VCSEL) that achieves low divergence and maintains a single-mode lasing. The 6-junction AR-VCSEL array demonstrates low divergence from 8° to 16° (D86) and tripled brightness compared to conventional counterparts. The AR-VCSEL offers an excellent avenue for long-distance LiDARs.

    • Cheng Zhang
    • , Huijie Li
    •  & Dong Liang

  • Article
    | Open Access

    Solid-state spatio-spectral coherent light detection and ranging system is proposed based on flutter-wavelength-swept laser for real-time four-dimensional coherent imaging over extended measurable distance even in challenging environments.

    • Dawoon Jeong
    • , Hansol Jang
    •  & Chang-Seok Kim

  • Article
    | Open Access

    Phosphor-glass composites can serve as efficient and stable photonic converters, but their synthesis generally requires harsh and time-consuming procedures. Here, the authors report an alternative synthesis route that requires only a few seconds and is based on particle self-stabilization.

    • Yongsheng Sun
    • , Yuzhen Wang
    •  & Zhiguo Xia

  • Article
    | Open Access

    Multifunctional active mid-infrared ring resonators and directional couplers with quantum cascade laser cores allow electrical control of resonant frequency and quality factors, tunable filtering and frequency comb generation.

    • Dmitry Kazakov
    • , Theodore P. Letsou
    •  & Federico Capasso

  • Article
    | Open Access

    Pulses of adjustable duration are generated by a mode-locked random fibre laser that can drive advances in sensing. Rayleigh backscattering from cm-long sections of telecom fibre provides laser feedback and spectral selectivity to the Fourier limit.

    • Jean Pierre von der Weid
    • , Marlon M. Correia
    •  & Walter Margulis

  • Article
    | Open Access

    Here the authors demonstrate a universal approach to achieve turnkey dissipative Kerr soliton (DKS) frequency comb. Phase insensitivity, self-healing capability, deterministic selection of DKS state, and access to ultralow noise are all successfully accomplished.

    • Mingming Nie
    • , Jonathan Musgrave
    •  & Shu-Wei Huang

  • Article
    | Open Access

    The authors report on the experimental observation and characterization of exceptional points above the lasing threshold in photonic crystal nanocavities.

    • Kaiwen Ji
    • , Qi Zhong
    •  & Alejandro M. Yacomotti

  • Article
    | Open Access

    Ultrahigh-efficiency and low-threshold yet tunable and compact laser devices are at the base of new functional devices. Here the authors harness a new temperature degree of freedom to realize a tunable photon-phonon collaboratively pumped laser.

    • Yu Fu
    • , Fei Liang
    •  & Yan-Feng Chen

  • Article
    | Open Access

    Designing robust blue organic light-emitting diodes is a long-standing challenge in the display industry. Here, the authors show that electron-induced degradation reactions play a more critical role in the short lifetime of devices with iridium-based emitters under real operational conditions.

    • Jaewook Kim
    • , Joonghyuk Kim
    •  & Woo Youn Kim

  • Article
    | Open Access

    Low-cost manufacturing of large-scale thermally activated delayed fluorescence organic light-emitting diodes has been restricted due to their incompatibility with solution processing techniques. Here, authors develop inkjet printing ink formulation to fabricate patterns without use of lithography.

    • Chandra Kant
    • , Atul Shukla
    •  & Monica Katiyar

  • Article
    | Open Access

    Methods to characterize the free-electron laser pulses are evolving and their performances are also improving. Here the authors demonstrate a method based on the artificial neural networks to predict the output pulses of the X-ray free-electron laser by considering the electron beam parameters as input.

    • Kenan Li
    • , Guanqun Zhou
    •  & Anne Sakdinawat

  • Article
    | Open Access

    The development of chemically diverse boron-oxygen-fused polycyclic aromatic hydrocarbons has been limited by their synthetic complexity. Here, authors report a one-pot strategy for their facile synthesis and demonstrate their potential as ultralong afterglow and host materials for deep-blue OLEDs.

    • Guijie Li
    • , Kewei Xu
    •  & Yuan-Bin She

  • Article
    | Open Access

    Laser machining can modify and reshape materials on the scale comparable to light’s wavelength. Here, authors use tailored microstructures to push the limit of laser machining to a scale that is almost 100 times smaller than a wavelength of light.

    • Maxim R. Shcherbakov
    • , Giovanni Sartorello
    •  & Gennady Shvets

  • Article
    | Open Access

    In this work the authors develop a Random optical parametric oscillator - the parametric analogous of random lasers. This system shows improved key metrics like tuneable repetition rates, tuneable pulse duration, inter-pulse coherence as well as simpler configuration compared with standard systems.

    • Pedro Tovar
    • , Jean Pierre von der Weid
    •  & Xiaoyi Bao

  • Article
    | Open Access

    Structural engineering at the subatomic level remains little for boosting operational stability of organic light-emitting diodes. Here, authors show that deuteration of acceptor is critical to enhance device stability, which is commonly neglected due to limited availability and synthetic complexity.

    • Sinyeong Jung
    • , Wai-Lung Cheung
    •  & Man-Chung Tang

  • Article
    | Open Access

    The hole injection and device stability rely heavily on the inorganic/organic interface in perovskite light-emitting diodes. The authors enhanced the NiOx/PVK interface with a self-assembled monolayer, resulting in blue and green devices with maximum efficiencies of 14.5% and 26.0%, respectively.

    • Zhenchao Li
    • , Ziming Chen
    •  & Hin-Lap Yip

  • Article
    | Open Access

    Deep-blue emitters and corresponding light-emitting devices are still in the progress to meet industrial standards. Here, the authors report catalytic interconversion of isomeric iridium(III) complexes and achieve true-blue emission and operational half-lifetime of over 10,000 h for tandem devices.

    • Jie Yan
    • , Dong-Ying Zhou
    •  & Yun Chi

  • Article
    | Open Access

    The understanding of the orientation of luminescent molecules is currently limited by the ensemble-averaging nature of state-of-the-art measurements. Here, the authors apply single-molecule imaging to obtain complete orientation distributions of the transition dipole of individual emitter molecules.

    • Francisco Tenopala-Carmona
    • , Dirk Hertel
    •  & Malte C. Gather

  • Article
    | Open Access

    The requirement of a high applied voltage remains a critical issue for blue organic-light emitting diodes. Here, the authors determine the appropriate donor-acceptor combination for triplet-triplet annihilation upconversion emission, achieving a low turn-on voltage of 1.47 V in blue devices.

    • Seiichiro Izawa
    • , Masahiro Morimoto
    •  & Masahiro Hiramoto

  • Article
    | Open Access

    Intense light pulses can create nonlinear ionization processes in atoms and molecules. Here the authors study the photoionization of xenon atoms using intense free-electron laser pulses that can create extremely high charge states and produce hollow atoms, featuring up to six simultaneous core-holes.

    • Aljoscha Rörig
    • , Sang-Kil Son
    •  & Rebecca Boll

  • Article
    | Open Access

    Emerged sustainable techniques for nitrogen fixation still lack ammonia yield rate to be practically relevant. Here, the authors demonstrate a laser–induced method to deliver a yield rate of 30.9 µmol s-1 cm−2 at ambient conditions, which is two orders of magnitude higher than other methods.

    • Huize Wang
    • , Ranga Rohit Seemakurthi
    •  & Markus Antonietti

  • Article
    | Open Access

    Effective energy transfer and suppressed dopant aggregation is critical for realizing efficient organic light-emitting diodes. Here, the authors report six host materials capable of exhibiting enhanced thermal stability and film-formation behavior, demonstrating efficiency of over 30% at 1000 cd/m2.

    • Dongmin Park
    • , Seokwoo Kang
    •  & Soo Young Park

  • Article
    | Open Access

    Since their initial operation, free-electron lasers are regularly upgraded in their performance and parameter control. Here the authors present the first lasing results of the soft X-ray free-electron laser beamline of the Paul Scherrer Institute, demonstrating different modes of operation and polarisation control of the tailored soft X-ray pulses.

    • Eduard Prat
    • , Andre Al Haddad
    •  & Tobias Weilbach

  • Article
    | Open Access

    Mid-infrared light emitting diodes (LEDs) based on black phosphorus (BP) have shown promising performance, but they are usually limited by the environmental instability of the material. Here, the authors extrapolate a room-temperature operational lifetime of BP LEDs up to ~ 15,000 h via Al2O3 passivation and nitrogen seal packaging.

    • Naoki Higashitarumizu
    • , Shogo Tajima
    •  & Ali Javey

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