( Luminescence ( ( is ( ( the emission ) ( of ( light ( without heat ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Luminescence)) (VP (VBZ is) (NP (NP (DT the) (NN emission)) (PP (IN of) (NP (NP (NN light)) (PP (IN without) (NP (NN heat))))))) (. .)))
Luminescence is the emission of light without heat.
(ROOT (S (NP (NNP Luminescence)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN of) (NP (NP (DT the) (NN process)) (SBAR (WHADVP (WRB where)) (S (NP (NN light)) (VP (VBZ is) (VP (VBN produced) (PP (IN without) (NP (NN heat))))))))))) (. .)))