0000000000276750

AUTHOR

H.-j. Bühlmann

showing 2 related works from this author

Suppression of leakage currents in GaN-based LEDs induced by reactive-ion etching damages

2008

Forward and reverse leakage currents in GaN/InGaN multi-quantum well light-emitting diodes (LEDs) are caused by reactive-ion etching (RIE) damages during device patterning. A method to recover the damaged surfaces, based on a chemical etch in KOH: ethylene-glycol is described. Leakage currents decrease of more than a factor of 10 and are completely suppressed in most of devices.

Materials sciencebusiness.industryN-TYPE GANLIGHT-EMITTING-DIODEStechnology industry and agriculturePLASMA-INDUCED DAMAGECondensed Matter PhysicsElectronic Optical and Magnetic Materialslaw.inventionlawOptoelectronicsReactive-ion etchingbusinessInstrumentationDiodeLight-emitting diodeLeakage (electronics)The European Physical Journal Applied Physics
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Blue lasing at room temperature in high quality factor GaN/AlInN microdisks with InGaN quantum wells

2007

The authors report on the achievement of optically pumped III-V nitride blue microdisk lasers operating at room temperature. Controlled wet chemical etching of an AlInN interlayer lattice matched to GaN allows forming inverted cone pedestals. Whispering gallery modes are observed in the photoluminescence spectra of InGaN/GaN quantum wells embedded in the GaN microdisks. Typical quality factors of several thousands are found (Q>4000). Laser action at similar to 420 nm is achieved under pulsed excitation at room temperature for a peak power density of 400 kW/cm(2). The lasing emission linewidth is down to 0.033 nm.

PhotoluminescenceMaterials sciencePhysics and Astronomy (miscellaneous)business.industryBOXESSettore ING-INF/01 - ElettronicaSemiconductor laser theoryGANOptical pumpingMICROCAVITIESLaser linewidthOpticsLASERSSemiconductors Laser physics Photoluminescence spectroscopy Oscillator strengths Quantum wells Optical absorption Whispering gallery wave Nitrides Etching Electrical properties and parametersOptoelectronicsStimulated emissionWhispering-gallery waveGAAS MICRODISKSbusinessLasing thresholdQuantum well
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