Collimated Light Source Using Patterned Organic Light-Emitting Diodes and Microlens

Aratani, Sukekazu; Adachi, Mitsuru; Shimizu, Masao; Shimoda, Tatsuya; Shibasaki, Toshinari; Shimazaki, K.

doi:10.1143/jjap.49.042101

Cited by 11 publications

(8 citation statements)

References 21 publications

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“…Alternatively, thin‐film LED pixels can be made into line or point sources with microlens arrays to collimate the emitted light (Figure S1b, Supporting Information). [ 21 ] This approach has been used in white emitting OLEDs to demonstrate a small beam divergence angle of 9°, [ 22,23 ] but due to its small pixel size, the maximum brightness per area is limited and therefore this approach is not practical.…”

Section: Figurementioning

confidence: 99%

Directional Polarized Light Emission from Thin‐Film Light‐Emitting Diodes

Mehta

Chen

et al. 2021

Advanced Materials

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Light‐emitting diodes (LEDs) with directional and polarized light emission have many photonic applications, and beam shaping of these devices is fundamentally challenging because they are Lambertian light sources. In this work, using organic and perovskite LEDs (PeLEDs) for demonstrations, by selectively diffracting the transverse electric (TE) waveguide mode while suppressing other optical modes in a nanostructured LED, the authors first demonstrate highly directional light emission from a full‐area organic LED with a small divergence angle less than 3° and a TE to transverse magnetic (TM) polarization extinction ratio of 13. The highly selective diffraction of only the TE waveguide mode is possible due to the planarization of the device stack by thermal evaporation and solution processing. Using this strategy, directional and polarized emission from a perovskite LED having a current efficiency 2.6 times compared to the reference planar device is further demonstrated. This large enhancement in efficiency in the PeLED is attributed to a larger contribution from the TE waveguide mode resulting from the high refractive index in perovskite materials.

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Section: Figurementioning

confidence: 99%

Directional Polarized Light Emission from Thin‐Film Light‐Emitting Diodes

Mehta

Chen

et al. 2021

Advanced Materials

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“…The development of new dual-state emission luminogens (DSEgens) has attracted increasing attention because of their wide potential application in various areas, such as optical devices, − chem-sensing, bioimaging, − tumor detection, and drug delivery systems . Normally, most of traditional organic fluorescent materials face the aggregation-caused quenching (ACQ) effect due to their planar structures, which cause the π – π stacking interactions in the solid state .…”

Section: Introductionmentioning

confidence: 99%

One-Step Transformations from ACQ Luminogens to DSEgens via the Boc Protection Process

Wei

et al. 2023

ACS Omega

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Dual-state emission luminogens (DSEgens), as a new type of luminescent materials that can effectively emit light in solution and solid state, have attracted tremendous attention due to their potential application in chemical sensing, biological imaging, organic electronic devices, etc. In this study, two new rofecoxib derivatives ROIN and ROIN-B have been synthesized, and their photophysical properties are fully investigated by experimental studies and theoretical calculations. The key intermediate ROIN, resulting from one-step conjugation of rofecoxib with an indole unit, shows the classical aggregation-caused quenching (ACQ) effect. Meanwhile, by introducing a tert-butoxycarbonyl (Boc) group on the basis of ROIN without enlarging the π conjugation system, ROIN-B was successfully developed with an obvious DSE property. In addition, both fluorescent behaviors and their transformation from ACQ to DSE were elucidated clearly by going through the analysis of their single X-ray data. Moreover, the target ROIN-B, as a new DSEgens, also displays reversible mechanofluorochromism and lipid droplet-specific imaging ability in HeLa cells. Taken together, this work proposes a precise molecular design strategy to afford a new DSEgens, which may provide guidance for the future exploration of new DSEgens.

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“…This set of characteristics may lead to better processability of these compounds, looking for complementary applications. For instance, organic compounds that have shown fluorescence in solution are now being used in medicine (i.e., bioimaging) − or materials chemistry (i.e., sensors). − Furthermore, solid organic emitters are now being used as active layers in organic light-emitting diodes (OLEDs), − solar cells, or even supramolecular encryption systems (Figure ). To attain a more comprehensive perspective, the reader is referred to excellent reviews focusing on compounds emissive in a single state, either in solution or in the solid, in the form of aggregates or crystalline materials. − …”

Section: Introductionmentioning

confidence: 99%

Dual-State Emission (DSE) in Organic Fluorophores: Design and Applications

et al. 2021

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Organic luminescent materials have attracted significant attention in the past few years due to their fascinating photophysical properties. Implementing these emissive organic compounds is now being actively pursued in many applications in solution (i.e., sensors, bioimaging) or their solid forms (i.e., optoelectronic devices or data encryption). Despite significant advances in the development of emissive compounds, there has been an increasing quest in the past decade for materials where the emission is preserved in both states, dual-state emission (DSE). These compounds are expected to detonate a myriad of applications in the future. On this nascent topic, this work addresses several factors that increase the probability of obtaining the dual-state emission property based on the precedent reports showing this phenomenon. Therefore, this review identifies and organizes the different structural characteristics useful to obtain these compounds. In addition, it has been devised to motivate the discussion in the materials science community and hopefully incentivize the efforts of many research groups around the world toward the synthesis of new dual-state emitters.

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Collimated Light Source Using Patterned Organic Light-Emitting Diodes and Microlens

Cited by 11 publications

References 21 publications

Directional Polarized Light Emission from Thin‐Film Light‐Emitting Diodes

Directional Polarized Light Emission from Thin‐Film Light‐Emitting Diodes

One-Step Transformations from ACQ Luminogens to DSEgens via the Boc Protection Process

Dual-State Emission (DSE) in Organic Fluorophores: Design and Applications

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