TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The transparent resin further comprises a hydrosilylation catalyst. The encapsulating material has a light transmission of 80-100%. The light transmission decrease is less than or equal to 15% weight, when the encapsulating material is heated at 120 degrees C for 500 hours. The light transmission decrease ratio is less than or equal to 15% weight, when the encapsulating material is heated at 180 degrees C for 150 hours. The encapsulating material has an adhesive force of less than or equal to 100 kgf. Preferred Components: The polysiloxane I is of formula ((R1R2R3 SiO(1/2)M1 (R4R5 SiO(2/2)) D1 (R6 SiO(3/2)) T1 (SiO(4/2)Q1) (I). The polysiloxane II is of formula ((R7R8R9 SiO(1/2))M2 (R10R11SiO(2/2))D2 (R12 SiO(3/2))T2 (SiO(4/2))Q2) (II). The silicon-hydrogen bond and the silicon-alkenyl bond are present in a ratio of greater than or equal to 1.05 to less than or equal to 1.5 in the transparent resin. The weight proportion of polysiloxane I based on the total amount of the transparent resin is less than or equal to 50 wt. %, and the weight proportion of polysiloxane II based on the total amount of the transparent resin is greater than 50 wt.%.R1-R6 = 1-30C alkyl, 3-30C cycloalkyl, 6-30C aryl, 7-30C arylalkyl, 1-30C heteroalkyl, 2-30C heterocycloalkyl, 2-30C alkynyl, 1-30C alkoxy, 1-30C carbonyl (all optionally substituted), H and/or hydroxy; eitherM1, D1 = greater than 0-less than 1; andT1, Q1 = 0-less than 1; orM1+D1+T1+Q1 = 1;R7-R12 = 1-30C alkyl, 3-30C cycloalkyl, 6-30C aryl, 7-30C arylalkyl, 1-30C heteroalkyl, 2-30C heterocycloalkyl, 2-30C alkenyl, 2-30C alkynyl, 1-30C alkoxy, 1-30C carbonyl (all optionally substituted) and/or hydroxy; and eitherM2, D2, T2 = greater than 0-less than 1; andQ2 = 0-less than 1; or M2+D2+T2+Q2 = 1.Provided that at least one of R1-R6 is hydrogen and at least one of R7-R12 is optionally substituted 2-30C alkenyl. EXAMPLE - A polysiloxane of formula ((Me2HSiO(1/2))2(Ph2SiO(2/2)) (13.6 wt.%) and a polysiloxane of formula ((Me2ViSiO(1/2))(0.13)(PhSiO(3/2))(0.3)(PhMeSiO(2/2))(0.57)) (86.4 wt.%) were mixed. Then PS-CS-2.0CS (manufactured by Unicore) as a hydrosilylation catalyst and Surfynol (RTM: Surfactant) (0.002 wt.%) as a catalyst inhibitor were added to the mixture to prepare the transparent resin.