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Departmental Colloquium

Spin-polarized organic light emitting diode based on a novel bipolar spin-valve  
Guest Speaker
Prof. Tho Nguyen  
Guest Affiliation
UGA Physics and Astronomy  
Guest Affiliation Url  
Thursday, March 6, 2014 4:00 pm - 5:00 pm  
Physics Auditorium (Rm 202)  

The spin-polarized organic light emitting diode (spin-OLED) has been long sought device within the field of Organic Spintronics. We designed, fabricated and studied a spin-OLED with ferromagnetic (FM) electrodes that acts as a bipolar organic spin valve (OSV), based on deuterated derivative of poly(phenylene-vinylene) with small hyperfine interaction [1]. In the double-injection limit the device shows ~1% spin-valve magneto-electroluminescence (MEL) response that follows the FM electrode coercive fields, which originates from the bipolar spin-polarized space charge limited current [2]. Our findings provide a pathway for organic displays controlled by external magnetic fields. Here is the outline of my talk. First, the background of magneto-resistance in OLEDs and OSVs are reviewed. Next, I present some previous attempts to achieve spin-OLEDs. Finally, I show our success on demonstrating spin-LEDs. If the time permits, I will go over the current advances toward Organic Spintronics in our laboratory.