Luminescence of poly(N-vinylcarbazole) films at 77 K. I. Fluorescence, phosphorescence and delayed fluorescence

Rippen, Gerd; Kaufmann, G.; Klöpffer, Walter

doi:10.1016/0301-0104(80)85194-9

Cited by 63 publications

(30 citation statements)

References 34 publications

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“…450 nm. These bands are attributed to radiative recombination occurring from excimeric (525 nm) and monomeric (450 nm) triplet states of carbazol-9-yl groups and can also be observed in the isothermal luminescence decay spectrum recorded at 15 K [13,15,16]. An addition of the PBD to the PVK causes an appearance of a new maximum at ca.…”

Section: Resultsmentioning

confidence: 96%

Thermoluminescence of the blue light-emitting system based on poly(9-vinylcarbazole) doped with a pyrazoloquinoline dye

Luszczynska

Dobruchowska

Glowacki

et al. 2009

Journal of Luminescence

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Section: Resultsmentioning

confidence: 96%

Thermoluminescence of the blue light-emitting system based on poly(9-vinylcarbazole) doped with a pyrazoloquinoline dye

Luszczynska

Dobruchowska

Glowacki

et al. 2009

Journal of Luminescence

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“…Therefore, it is reasonable to infer that the green emission in the EL should arise from the phosphorescence of PVK and to assign the two emission peaks at 493 and 516 nm to the phosphorescence emissions of f-PVK and p-PVK, respectively. 13,17 The proposal is supported by the emission lifetimes determined by transient EL. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Electroluminescence of poly(N-vinylcarbazole) films: fluorescence, phosphorescence and electromers

Chen

2010

Phys. Chem. Chem. Phys.

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We have studied the electroluminescence (EL) properties of pure poly(N-vinylcarbazole) (PVK) films. Three types of light emission in the EL spectrum were observed, attributed to fluorescence, phosphorescence and electromers, respectively. The observation of electrophosphorescence from PVK films at room temperature is very meaningful, indicating that PVK can produce a large number of triplet excitons under an electric field at room temperature. Our results demonstrate clearly the reason why PVK is an excellent host material for phosphorescent polymer light-emitting diodes (PLEDs).

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“…The phosphorescence properties of PVK in solutions and in rigid isolated matrices has been studied in the past20–28 and the triplet level has been reported to reach 3 eV in solution which seems high enough for any blue dopant 21, 22. In PVK films, it has also been reported that the triplet level is close to this value, ∼2.9 eV 20.…”

Section: Introductionmentioning

confidence: 98%

Is Poly(vinylcarbazole) a Good Host for Blue Phosphorescent Dopants in PLEDs? Dimer Formation and Their Effects on the Triplet Energy Level of Poly(N‐vinylcarbazole) and Poly(N‐Ethyl‐2‐Vinylcarbazole)

Jankus

Monkman

2011

Adv Funct Materials

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The detailed measurement and analysis of the delayed emission from poly(vinylcarbazole) (PVK) and poly( N -ethyl-2-vinyl-carbazole) (P2VK) thin fi lms is described. PVK has rapidly become a "polymer of choice" for hosting phosphorescent dopants in PLEDs, especially blue emitters. In this respect it is important to have a full understanding of the triplet properties of this host. It is concluded that in fi lms, the electronic 0-0 peak energy of PVK phosphorescence is found at 2.88 eV (14 K). With an increase of temperature, > 44 K, increasing emission from new long lived, lower energy species, previously ascribed to "trap states" in the literature, is observed. Increasing temperature enables thermally assisted triplet exciton hopping to these trap states. Critically it is shown that some of these triplet trap species are ground state triplet dimers in origin for both PVK (2.46 eV) and P2VK (2.1 eV), and not all of them are of excimer nature as previously thought. These species can quench the emission of blue heavy metal complexes doped in PVK and drastically effect performance over lifetime if the dimer formation increases over time and at elevated operating temperature. It is therefore concluded that PVK might not be such an ideal host material for blue phosphorescent emitters.

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Luminescence of poly(N-vinylcarbazole) films at 77 K. I. Fluorescence, phosphorescence and delayed fluorescence

Cited by 63 publications

References 34 publications

Thermoluminescence of the blue light-emitting system based on poly(9-vinylcarbazole) doped with a pyrazoloquinoline dye

Thermoluminescence of the blue light-emitting system based on poly(9-vinylcarbazole) doped with a pyrazoloquinoline dye

Electroluminescence of poly(N-vinylcarbazole) films: fluorescence, phosphorescence and electromers

Is Poly(vinylcarbazole) a Good Host for Blue Phosphorescent Dopants in PLEDs? Dimer Formation and Their Effects on the Triplet Energy Level of Poly(N‐vinylcarbazole) and Poly(N‐Ethyl‐2‐Vinylcarbazole)

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