( ( The property ) ( ( is ( called ( electro luminescence ) ) ) . ) )
(ROOT (S (NP (DT The) (NN property)) (VP (VBZ is) (VP (VBN called) (NP (NN electro) (NN luminescence)))) (. .)))
The property is called electro luminescence .
(ROOT (S (NP (NP (NNP Producing) (NN light)) (PP (IN without) (NP (NN heat)))) (VP (VBZ is) (VP (VBN called) (S (ADJP (JJ luminescence))))) (. .)))