An electronic element packaging module including a lead frame, an insulating layer and at least one electronic element is provided. The invention also relates to stabilized forms of liquid bisphosphines of formula and radiation curable composition comprising said stabilized photoinitiators. A first layer of ink is applied to the top surface, so that the ink, representing promotional material and other information, is visible through the clear plastic in the direction of the bottom surface of the backer. Applications include for example dielectric isolation in the semiconductor industry, as well as surface acoustic wave devices, scanning probe microscope, and atomic force microscope devices.