On the application of thermoluminescence for probing the energetic disorder in amorphous molecular solids

Blue iridium complexes as electron trapping sites and efficient recombination centres in poly(N-vinylcarbazole) seen by spectrally resolved thermoluminescence

“…It should be underlined that the presence of polar additives has an influence on the transport process in disordered molecular solids and such effects were reported and analysed by many research groups [25][26][27][28]. The effect of dipolar disorder was also studied by using the TL method [29,30]. Kadshchuk et al reported shift of TL band of poly(Nepoxypropylcarbazole) doped with strong polar dopants to higher temperatures [30].…”

“…The effect of dipolar disorder was also studied by using the TL method [29,30]. Kadshchuk et al reported shift of TL band of poly(Nepoxypropylcarbazole) doped with strong polar dopants to higher temperatures [30]. Shifting of one of the bands in the TL spectrum towards the higher temperatures was also observed after doping PVK/PBD blend and PVK with Ir(ppy) 3 (value of the dipole moment about 6 D) [18].…”

The impact of 1 wt% of Ir(ppy) 3 on trapping sites and radiative recombination centres in PVK and PVK/PBD blend seen by thermoluminescence

“…It indicates on the presence of 36 slightly deeper traps as compared with those in the neat matrices. The effect is caused by the interaction 37 of trapped carriers and randomly oriented high permanent dipoles of Ir(ppy) 3 . In addition, the 38 experiments of spectrally resolved TL (SRTL) provide evidence that the presence of the dopant creates 39 a new channel of energy transfer.…”

New Conjugated Ladder Polymer Containing Carbazole Moieties

“…It should be noted that similar effects were observed during the blending of dipolar additives or dipolar charge-transporting molecules into molecularly doped polymers (MDP), [25±27] or by the introduction of dipoles into r-conjugated polysilanes [28] and polymers containing side-chain carbazole units. [29] Dipolar effects on energetic disorder for charge carriers are well known and thoroughly studied for MDPs and other organic photoconducting materials. [25] They can be described in terms of the dipolar disorder model [26] according to Borsenberger and Bässler, which predicts a linear increase of a so-called dipolar component of disorder r dip with increasing dipole moment.…”