Abstract
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> In this letter, we report a near-infrared (NIR) optical upconverter consisting of an integrated InGaAs–InP heterojunction phototransistor (HPT) with an organic light-emitting diode (OLED), which converts 1.5-<formula formulatype="inline"><tex Notation="TeX">$\mu\hbox{m}$</tex></formula> IR light to visible light with a built-in electrical gain. The device was fabricated through direct tandem integration of an OLED with an inorganic InGaAs–InP HPT. Incoming 1.5-<formula formulatype="inline"><tex Notation="TeX">$\mu\hbox{m}$</tex> </formula> optical radiation is absorbed by the HPT, generating an amplified photocurrent. The resultant photocurrent drives the OLED that emits at 545 nm. Upconversion is demonstrated at room temperature with a gain of 15 from the HPT and an overall external upconversion efficiency of 0.15 W/W.<?Pub _bookmark="" Command="[Quick Mark]"?> </para>
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