Light emission from triplet excitons in light emitting devices (LED) is reviewed. The rate of spontaneous emission of triplet excitons is presented in inorganic amorphous semiconductors, molecular crystals and conjugated polymers containing platinum atoms in the chain. It is shown that the recently discovered new time-dependent spin-orbit-photon interaction operator is responsible for the radiative emission from triplet excitations in materials, and the transition occurs due to flipping of the spin. The rate depends on the square of the atomic number of the constituting atoms. The calculated rates and corresponding radiative lifetime agree very well with the known experimental results in conjugated polymers and inorganic amorphous semiconductors. Rates in molecular crystals are compared with those obtained from the traditional theory.
|Title of host publication||Journal of Optoelectronics and Advanced Materials|
|Place of Publication||Bucharest, Romania|
|Publisher||National Institute of Materials Physics|
|Number of pages||6|
|Publication status||Published - 2009|
|Event||2009 International School on Condensed Matter Physics - Varna, Bulgaria|
Duration: 31 Aug 2008 → 5 Sep 2008
|Conference||2009 International School on Condensed Matter Physics|
|Period||31/08/08 → 5/09/08|
Singh, J. (2009). Missing links for triplet radiative recombination in light emitting devices. In Journal of Optoelectronics and Advanced Materials (Vol. 11, pp. -). National Institute of Materials Physics.