AlGaInN resonant-cavity LED devices studied by electromodulated reflectance and carrier lifetime techniques

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AlGaInN resonant-cavity LED devices studied by electromodulated reflectance and carrier lifetime techniques

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AlGaInN-based resonant-cavity light-emitting diodes (RCLEDs) emitting in the blue at 480 nm are investigated. The electromodulated reflectivity spectra of these devices exhibit a blue shift of the quantum well (QW) feature when it is perturbed with increasing reverse bias pulses. This is due to a reduction of the quantum-confined Stark-effect and this is used to calculate the average piezo-electric field in the QW as 0.62 ± 0.12 MV/cm. Measurements of the light-current characteristics of processed devices between 20 °C and 85 °C and of the modulation bandwidth are also used to characterise the samples and to compare their performance with conventional LEDs. Compared to AlGaInP-based RCLEDs, it is found that the AlGaInN-based RCLEDs are less temperature sensitive, while their modulation characteristics are similar, and better than conventional InGaN-based LEDs. The radiative lifetime was estimated to be 2 ns at a current density of 170 A/cm2.

Inspec keywords: quantum well devices; aluminium compounds; electro-optical modulation; gallium compounds; light emitting diodes; indium compounds; spectral line shift; optical resonators; radiative lifetimes; III-V semiconductors; electroreflectance

Other keywords: AlGaInN resonant-cavity LED devices; modulation characteristics; quantum-confined Stark-effect; carrier lifetime techniques; AlGaInN; 2 ns; 85 degC; current density; quantum well feature; 480 nm; piezo-electric field; electromodulated reflectance; blue shift; electromodulated reflectivity spectra; radiative lifetime

Subjects: Electro-optical effects (condensed matter); Optical properties of II-VI and III-V semiconductors (thin films, low-dimensional and nanoscale structures); Light emitting diodes; Electro-optical devices; Optical beam modulators; Semiconductor superlattices, quantum wells and related structures

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