Design, fabrication and application of GaN-based micro-LED arrays with individual addressing by n-electrodes

Enyuan Xie, Mark Stonehouse, Ricardo Ferreira, Jonathan J. D. McKendry, Johannes Herrnsdorf, Xiangyu He, Sujan Rajbhandari, Hyunchae Chun, Aravind V.N. Jalajakumari, Oscar Almer, Grahame Faulkner, Ian M. Watson, Erdan Gu, Robert Henderson, Dominic O'Brien, Martin D. Dawson

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)
    40 Downloads (Pure)


    We demonstrate the development, performance, and application of a GaN-based
    micro-light emitting diode (µLED) array sharing a common p-electrode (anode), and with individually
    addressable n-electrodes (cathodes). Compared to conventional GaN-based LED
    arrays, this array design employs a reversed structure of common and individual electrodes,
    which makes it innovative and compatible with n-type metal-oxide-semiconductor (NMOS)
    transistor-based drivers for faster modulation. Excellent performance characteristics are illustrated
    by an example array emitting at 450 nm. At a current density of 17.7 kA/cm2 in
    direct-current operation, the optical power and small signal electrical-to-optical modulation
    bandwidth of a single µLED element with 24 µm diameter are over 2.0 mW and 440 MHz,
    respectively. The optimized fabrication process also ensures a high yield of working µLED
    elements per array and excellent element-to-element uniformity of electrical/optical characteristics.
    Results on visible light communication are presented as an application of an array
    integrated with an NMOS driver. Data transmission at several hundred Mb/s without bit error
    is achieved for single- and multiple-µLED-element operations, under an ON–OFF-keying
    modulation scheme. Transmission of stepped sawtooth waveforms is also demonstrated to
    confirm that the µLED elements can transmit discrete multilevel signals.
    Original languageEnglish
    Article number7907811
    Number of pages13
    JournalIEEE Photonics Journal
    Issue number6
    Publication statusPublished - 14 Nov 2017


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