Photoluminescence spectroscopy study on tris(8-hydroxyquinoline) aluminum film

Investigation of photoluminescence degradation and OLED device of a new polysilane

“…Lowering of temperature reduces thermal disorder, whose presence implies molecular torsions, which in turn, limit the conjugation length. On the other hand, in Alq3, the shift of PL peak is towards higher energies, as we observe in P-8, when temperature is decreased [7]. This change in Alq3 is thought to occur due to morphological changes.…”

Morphological phase transitions in films

“…In particular, recent thermal treatments have shown both sizeable spectral and intensity variations of PL in Alq 3 films [2][3][4][5][6][8][9][10][11][12], and it has also been found that post annealing treatments contribute to better efficiency and lifetime enhancement of OLEDs containing Alq 3 [13][14][15][16][17][18]. However, the above studies are far from being systematic, and hardly clarify the properties of Alq 3 thin films, as far as the consequences of thermal treatments on PL and aggregation processes are concerned.…”

Why Annealing Processes Affect the Optical Properties of Alq3 Films and OLEDs

“…At the same time, better efficiency and lifetime enhancement of OLEDs containing Alq 3 were obtained by performing post annealing treatments and the results published by several groups (7)(8)(9)(10)(11)(12)(13). It was also found that thermal treatments of thin films of Alq 3 affect both photoluminescence, PL, and lifetime (14)(15)(16)(17)(18)(19)(20)(21)(22)(23), which in a few cases were accurately measured during long time degradation processes, over 1,000 h (19,20).…”