Highly Efficient OLEDs with Phosphorescent Materials by Hartmut Yersin PDF

By Hartmut Yersin

ISBN-10: 3527405941

ISBN-13: 9783527405947

This brand-new monograph on natural gentle emitting diodes, edited through a pioneer, and written via front-line researchers from academia and undefined, presents entry to the most recent findings during this quickly becoming box. greater than ten contributions conceal all parts -- from idea and easy rules, to various emitter fabrics and purposes in creation.

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4 (right-hand side). A quantum mechanical consideration shows that the triplet state T1 (or 3pp*), consisting of three substates, is stabilized by an energy given by a difference of Coulomb integrals, while the singlet state S1 (or 1pp*) is destabilized relative to the triplet state by twice the exchange integral K = const × π(r1 )π*(r2 ) 1 π(r2 )π*(r1 ) r12 (3) wherein π and π* are the HOMO and LUMO wavefunctions, r1 and r2 represent the electron coordinates, and r12 the separation between the two electrons (compare, for example, Ref.

12 1 Triplet Emitters for Organic Light-Emitting Diodes: Basic Properties Fig. 4 Comparison of a HOMO-LUMO diagram to an energy state description. The configuration π2 leads to the ground state S0, while the configuration π1π*1 gives four different excited states, one singlet S1 and one triplet T1 which consists of three substates. By taking the change of electron–electron interaction for both configurations into account, usually a significant ∆E(S1 − T1) splitting is obtained. For ligands which are in the focus of this contribution, ∆E(S1 − T1) can be as large as 104 cm−1.

For largely ligand-centered 3LC states of organo-transition metal complexes, the value of ZFS lies in the same order of magnitude. 1 × 10−5 eV) [85]. However, SOC carried by metal d-orbitals can drastically increase the magnitude of ZFS, as found for 3MLCT states. 4, and Refs. ) In this situation, the small contribution from spin–spin interactions can be neglected. For completeness it is mentioned that, although the ZFS values of only slightly perturbed 3LC(3pp*) states of organo-transition metal compounds are of similar size, as found for purely organic molecules, the metal can manifest itself already drastically by increasing radiative and/or non-radiative rates.

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Highly Efficient OLEDs with Phosphorescent Materials by Hartmut Yersin


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