Effects of Electric Fields on Cathodoluminescence from II-VI Quantum Well Light Emitting Diodes

Nikiforov, Alexander Y.; Cargill, G. S.; Tamargo, M. C.; Guo, Shiping; Chen, Y. C.

doi:10.1557/proc-692-h9.26.1

Cited by 3 publications

References 10 publications

(18 reference statements)

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Time‐ and bias‐dependent effects in ZnCd(Mg)Se blue and red quantum well light emitting diodes studied by cathodoluminescence

Nikiforov

Cargill

Guo

et al. 2004

Physica Status Solidi (b)

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Luminescence variations in MBE-grown blue and red ZnCd(Mg)Se/InP QW LEDs have been studied by time-resolved and bias-dependent cathodoluminescence (CL) spectroscopy. CL from the red LED reversibly increased under forward bias and decreased under negative bias during several complete biasing cycles. CL from blue LEDs was bias dependent only during the first few cycles. The irreversible effects were QW CL intensity decreases after electron bombardment for the red LED and QW CL intensity enhancements seen as bright regions in CL images and dark regions in SE micrographs for blue LEDs. For the red LED, the bombarded regions were dark in CL images and had a dark dot and halo contrast in SE micrographs. The enhancements of CL intensity in the blue LEDs may result from buildup of internal fields due to persistent charge trapping in preexisting or electron bombardment created defects. 1 Introduction ZnSe-based chalcogenides are promising materials for short wavelength light emitting diodes (LEDs) and lasers for higher density optical disk information storage systems, full-color projection displays, traffic signals, and efficient white light sources. Despite significant progress in the materials development, commercially successful devices have not been yet achieved because of gradual luminescent intensity degradation during device operation.Since operation of electron devices requires application of electric fields, it is necessary to understand the effects of bias on luminescence and carrier transport. It may also help in further improvement of performance and lifetimes of QW-based light emitting diodes (LEDs) and laser diodes. The present paper describes effects observed during bias cycling cathodoluminescence (CL) experiments on red and blue ZnCdMgSe-based QW LEDs.

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Time‐ and bias‐dependent effects in ZnCd(Mg)Se blue and red quantum well light emitting diodes studied by cathodoluminescence

Nikiforov

Cargill

Guo

et al. 2004

Physica Status Solidi (b)

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A simple quasiclassical treatment of bias-dependent carrier capture in quantum wells

Cargill

2008

2008 Conference on Optoelectronic and Microelectronic Materials and Devices

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Cathodoluminescence, Electroluminescence, and Degradation of ZnCdSe Quantum Well Light Emitting Diodes

et al. 2003

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We have studied luminescence and degradation of a ZnCdMgSe/ZnCdSe/ZnCdMgSe QW LED grown by MBE and lattice matched to its InP substrate. Results have been obtained from time-resolved and bias-dependent cathodoluminescence spectroscopy and from electroluminescence spectroscopy. Reversible and irreversible variations in luminescence intensity were observed during bias cycling and electron bombardment. Cathodoluminescence from the QW LED was modeled by calculating current generation and transport, bias-dependent energy levels, envelope wave functions, overlap integrals, and carrier escape rates. Results of these calculations agree qualitatively, but not quantitatively, with bias-dependent intensity and wavelength changes observed in the experiments.

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Effects of Electric Fields on Cathodoluminescence from II-VI Quantum Well Light Emitting Diodes

Cited by 3 publications

References 10 publications

Time‐ and bias‐dependent effects in ZnCd(Mg)Se blue and red quantum well light emitting diodes studied by cathodoluminescence

Time‐ and bias‐dependent effects in ZnCd(Mg)Se blue and red quantum well light emitting diodes studied by cathodoluminescence

A simple quasiclassical treatment of bias-dependent carrier capture in quantum wells

Cathodoluminescence, Electroluminescence, and Degradation of ZnCdSe Quantum Well Light Emitting Diodes

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