Hybrid GaN LED with capillary-bonded II–VI MQW color-converting membrane for visible light communications

Santos, Joao M M and Jones, Brynmor E and Schlosser, Peter J and Watson, Scott and Herrnsdorf, Johannes and Guilhabert, Benoit and Mckendry, Jonathan and De Jesus, Joel and Garcia, Thor A and Tamargo, Maria C and Kelly, Anthony E and Hastie, Jennifer E and Laurand, Nicolas and Dawson, Martin D (2015) Hybrid GaN LED with capillary-bonded II–VI MQW color-converting membrane for visible light communications. Semiconductor Science and Technology, 30 (3). ISSN 0268-1242

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Abstract

The rapid emergence of gallium-nitride (GaN) light-emitting diodes (LEDs) for solid-state lighting has created a timely opportunity for optical communications using visible light. One important challenge to address this opportunity is to extend the wavelength coverage of GaN LEDs without compromising their modulation properties. Here, a hybrid source for emission at 540 nm consisting of a 450 nm GaN micro-sized LED (micro-LED) with a micron-thick ZnCdSe/ZnCdMgSe multi-quantum-well color-converting membrane is reported. The membrane is liquid-capillary-bonded directly onto the sapphire window of the micro-LED for full hybridization. At an injection current of 100 mA, the color-converted power was found to be 37 μW. At this same current, the −3 dB optical modulation bandwidth of the bare GaN and hybrid micro-LEDs were 79 and 51 MHz, respectively. The intrinsic bandwidth of the color-converting membrane was found to be power-density independent over the range of the micro-LED operation at 145 MHz, which corresponds to a mean carrier lifetime of 1.9 ns.