16% external quantum efficiency from planar microcavityLEDsat 940 nm by precise matching of cavity wavelength

Blondelle, J.; Neve, H. De; Demeester, Piet; Daele, Peter Van; Borghs, Gustaaf; Baets, Roel

doi:10.1049/el:19950884

Cited by 42 publications

(18 citation statements)

References 4 publications

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“…The LED structure that we used is a variant of the design used by Blondelle et al, 7 with a hybrid top mirror rather than a pure metal mirror. A schematic diagram of the MCLED is shown in Fig.…”

Section: ͓S0003-6951͑98͒04052-2͔mentioning

confidence: 99%

Effect of detuning on the angular emission pattern of high-efficiency microcavity light-emitting diodes

Dill

Stanley

Oesterle

et al. 1998

Applied Physics Letters

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Section: ͓S0003-6951͑98͒04052-2͔mentioning

confidence: 99%

Effect of detuning on the angular emission pattern of high-efficiency microcavity light-emitting diodes

Dill

Stanley

Oesterle

et al. 1998

Applied Physics Letters

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“…6,7 These last few years, a much effort has been devoted to optimizing and studying the extraction efficiency of MCLEDs. [7][8][9][10][11] Hence, as the extraction efficiency of LEDs significantly increases, there is more interest and need in optimizing the electron to photon conversion efficiency of these devices, i.e., the internal quantum efficiency int ϭ⌽ int /⌽ el . Although this parameter can be easily measured at high current densities for lasers, 12 no simple way of determining int exists for LEDs operating at low current densities.…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of the internal quantum efficiency of AlGaInP microcavity light-emitting diodes

Royo

Stanley

Ilegems

et al. 2002

Journal of Applied Physics

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Detailed study of external quantum efficiency ηQE is reported for AlGaInP-based microcavity light-emitting diodes (MCLEDs). Unlike conventional light-emitting diodes (LEDs) the extraction efficiency γext and far field profile depend on the linewidth of the intrinsic spontaneous emission and wavelength detuning between cavity mode and peak electroluminescence. This dependence makes it difficult to estimate the intrinsic spectrum, hence the performances of MCLEDs. By using a nondestructive deconvolution technique, the intrinsic spectra of a MCLED and a reference LED (with the same active regions) could be determined at different current densities. This allowed precise calculation of γext for both devices (values close to 11% were found for the MCLED), and hence of their apparent internal quantum efficiencies ηintapp. At 55 A/cm2, values of 90% and 40% were determined for the LED and MCLED, respectively. In order to explain this difference, we measured ηQE for devices with different sizes. From a fitting procedure based on a simple model taking into account the device size, we found that the radiative efficiencies of LEDs and MCLEDs were close to 90%. We concluded that the low ηintapp of MCLED was due to a bad current injection, and especially to electron leakage current, as confirmed by numerical simulations.

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“…Microcavities have already shown large external QE's and directional light emission useful for fiberoptic applications. [2][3][4][5][6] We optimized the layer structure of a substrate emitting microcavity LED and found that the light extraction efficiency of a microcavity layer structure surrounded by air can be 30%. If this layer structure would be encapsulated by an epoxy, the light extraction efficiency might even exceed 50%.…”

Section: Introductionmentioning

confidence: 99%

<title>Planar substrate-emitting-microcavity light-emitting diodes with 20% external QE</title>

Neve

Blondelle

Daele

et al. 1997

Light-Emitting Diodes: Research, Manufacturing, and Applications

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The external QE of microcavity light emitting diodes strongly depends on the device size and operational current density. Our experiments reveal that spectral broadening of the optical spectrum emitted by the three InGaAs QW's as well as photon recycling of photons originally emitted into the guided mode of the cavity can explain these differences. An optimized microcavity layer design yielded external QE's of 20% for substrate emitting light emitting diodes with diameters of 1 .5 mm.

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16% external quantum efficiency from planar microcavityLEDsat 940 nm by precise matching of cavity wavelength

Cited by 42 publications

References 4 publications

Effect of detuning on the angular emission pattern of high-efficiency microcavity light-emitting diodes

Effect of detuning on the angular emission pattern of high-efficiency microcavity light-emitting diodes

Experimental determination of the internal quantum efficiency of AlGaInP microcavity light-emitting diodes

<title>Planar substrate-emitting-microcavity light-emitting diodes with 20% external QE</title>

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