Optoelectronic Components & Materials Group

(above) A hemispherical array photodetector is pictured above. The curved detector surface allows this device to produce an undistorted, wide field image using only a single lens. Because it shares this attribute with the human eye, a hemispherical photodetector is informally called an artifical eye.

Conventional photodector arrays are printed on flat substrates, and must be combined with multiple lenses to produce high quality images. Organic photodetectors can be grown on curved substrates, enabling fabrication of an artifical eye.

You can read about this and other projects on our research page.

Optoelectronic Components & Materials Group

(Top) Cutaway of a dielectric low-index grid (LIG) embedded within the organic layer of an OLED to redirect light towards the forward viewing direction. By reducing the amount of light lost within the device structure and increasing the amount of light the the OLED emits into its environment, a LIG makes OLEDs more efficient.

(Bottom) Full electromagnetic wave simulations of Light outcoupling in OLEDs by a single grid cell for different grid geometries. High field regions appear in red.

A LIG can incrase light extraction from waveguided modes by nearly 50%. When this technique is coupled with additional methods to extract light, a nearly threefold enhancement in efficiency is achievable. You can read about this and other projects on our research page.

Optoelectronic Components & Materials Group

(above) Simulation depicting the denisty of organic vapor and streamlines of gas flow through an organic material source cell of OCM's Organic Vapr Jet Printer tool. Organic vapor jet printing uses an array of micronozzles to deposit multicolor phosphorescent organic thin film arrays for OLED applications. Warm colors correspond to high concentrations of organic vapor and cool colors correspond to lower concentrations. This image was featured of the cover of the Feb. 15 2012 issue of the Journal of Applied Physics.

You can read about this and other projects on our research page.

Optoelectronic Components & Materials Group

(above)Prof. Forrest and OCM alumna Xin Xu developed a process for printing patterned contacts onto curved surfaces. This technique was used in collaboration with University of Michigan researchers Carl Pfeiffer and Anthony Grbic to produce small, three dimensional antennas. The work is featured on the cover of the Feb. 24 2012 issue of Advanced Materials.

You can read about this and other projects on our research page.