We have examined the photon statistics of single tetrahedral based oligophenylenevinylene (TOPV) molecules using photon pair correlation spectroscopy (PPCS). The second-order correlation function g((2))(tau) can be obtained from PPCS and the value of g((2))(tau) at small tau can be used to quantify the number of chromophores involved in emission. Comparison of g((2))(tau) obtained from OPV,arms' versus TOPV revealed limited interchromophore coupling in TOPV. Unlike previous Studies on interchromophore coupling in organic semiconductors, TOPV molecules are able to sustain simultaneous emission from multiple arms. (C) 2004 Elsevier B.V. All rights reserved.