Abstract: We disclose a new concept to realize emitter color control through the control of conjugation length of the partially conjugated poly(phenylenevinylene) (PCPPV) emitter using the conjugation limited atoms in their polymer backbone. Silicon, nitrogen, oxygen and sulfur are used as the conjugation limitation atoms. The emitting color of PCPPV depends on the conjugation length. For example, PCPPV with a short conjugation length can emit blue color. Increasing the conjugation length, the emitting color can change to longer spectral band such as green and red color. This new concept enables the color tuning for the realization of white light emitting polymer without any complicated fabrication process. The white light emitter can be realized via simple mixing of different color PCPPV emitters and can also be realized through random copolymerization of PCPPV with moderated monomer feeding ratios.

Abstract: An evanescent optically coupled electronic device including: a backplane wave guide or mother board including a set of parallel carriers that define a first plurality of parallel channels and include a first array of optical fibers having exposed cores in the first plurality of parallel channels; at least one electronic card or daughter board including a high speed optical waveguide bus; a flexible fiber ribbon or film including waveguides made up of individual optical fibers of locally increased refractive index joined by a web of suitable material forming the high speed optical waveguide bus and optically connecting the backplane waveguide and the at least one electronic card with no 90° angle turns; and a mechanism for retaining the first array of optical fibers having exposed cores in abutting and facing evanescent optical contact with the individual optical fibers in the flexible fiber or ribbon.