## 1 Introduction  
When a superconducting (SC) material is brought in contact with a non-SC layer, the electronic coherence of the superconductor can be induced in the normal layer up to some penetration depth. This induction, known as the proximity effect, can result in the normal layer exhibiting the salient properties of superconductivity such as current flow for zero applied voltage [1, 2]. Recently, [PERSON] et al. developed an inorganic LED with a SC Nb cathode and reported a dramatic increase in quantum efficiency and a radiative recombination rate below TC, due to the proximity effect [3, 4]. Below TC, Cooper pairs created in the Nb layer are injected into the p-n junction of the superconductor-LED (SC-LED) where they induce superradiant correlations in the radiative recombination process [5, 6]. Several research teams predict that SC-LEDs will emit coherent laser-like emission with superior coherence metrics compared to traditional lasers [7, 8, 9], and discuss theoretically that SC-LEDs can be a source or detector of quantum entangled photons [10, 11, 12].  
Organic materials have the potential for extraordinary process flexibility, as there is no need for crystallinity or lattice matching in order to produce a thin film of organic semiconductor that is light-emitting. Utilizing organic semiconductors can overcome some of the processing limitations in combining SC and inorganic LEDs, working towards the making a superconductor-contacted OLED (SC-OLED).  
There are two critical challenges that one must overcome before trying to realize such a device: (i) processing difficulties--can the SCs and organics retain their properties when combined in an LED geometry? (ii) Is it possible to have proximity induced superconductivity in relevant organic materials? In this paper, we show that both challenges are surmountable.  
Combining organic materials with superconductors has been studied in a number of systems. A single island of graphene contacted laterally with W or Pb electrodes exhibited superconductivity below 1 K or around 5 K, respectively, due to the proximity effect [13; 14]. The proximity effect has also been shown in single strands of DNA, carbon nanotubes (CNTs), and single molecules of C60 [15; 16; 17]. The proximity effect was also investigated in conducting polymers contacted laterally by high-TC superconductors, but little effect was found due to material processing issues [18]. These studies substantiate that the proximity effect can be induced in organic materials, but there are no reports yet for proximity in thin films of light-emitting semiconductors that are more suitable for an LED architecture.  
Here, we studied organic light-emitting semiconductors that are contacted by superconducting electrodes in a vertically stacked \"SC-O-SC\" structure composed of a bottom SC electrode, an organic semiconductor layer, and then a top SC contact. The advantage of this architecture is that it easily expands to an OLED structure if the top SC electrode is transparent while remaining superconducting, which we show is possible. We found evidence for the proximity effect in the organic layer in the SC-O-SC structures, manifested by the large decrease in the layer's resistivity below the SCs' transition temperatures (TC) and the transport properties of the SC-O-SC devices.