Abstract: A printed circuit board (1) for an LED module (2) comprises mechanical weaknesses (11) in a substrate of the printed circuit board (1), which weaknesses form at least one at least electrically interruptible substrate bridge (12A, 12B), and a plug connector (13) having four terminals (13.1-13.4) A first LED light source (14) can be connected between a first anode-cathode pair (13.1, 13.4) of the four terminals (13.1-13.4), and a second LED light source (15) can be connected between a second anode-cathode pair (13.2, 13.3) of the four terminals (13.1-13.4) A pair of anodes (13.1,13.2) of the four terminals (13.1-13.4) is galvanically interconnected via a first (12A) of the at least one substrate bridges (12A, 12B) The printed circuit board (1) can be connected using the plug connector (13) to at least one LED driver for the LED module (2) via two or three separate galvanic connections depending on the state of the at least one substrate bridge (12A, 12B).

Abstract: In a multilayer organic device (10) comprising a substrate bearing an anode (12) and a cathode (20), wherein located between the anode (12) and the cathode (20) is at least a first layer (16) comprising a first organic semiconductor material; and a second layer (18) over the first layer (16) comprising a second organic semiconductor material; the first organic semiconductor material is a polymer and the second organic material is a polymer or an oligomer, the average molecular weight of the first organic semiconductor material being higher than the average molecular weight of the second organic semiconductor material.

Abstract: In a multilayer organic device (10) comprising a substrate bearing an anode (12) and a cathode (20), wherein located between the anode (12) and the cathode (20) is at least a first layer (16) comprising a first organic semiconductor material; and a second layer (18) over the first layer (16) comprising a second organic semiconductor material; the first organic semiconductor material is a polymer and the second organic material is a polymer or an oligomer, the average molecular weight of the first organic semiconductor material being higher than the average molecular weight of the second organic semiconductor material.