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Titolo:
Molecular weight dependence of the conformational phase transition and electroluminescence of diarylpolysilane diodes
Autore:
Hoshino, S; Furukawa, K; Ebata, K; Breyl, I; Suzuki, H;
Indirizzi:
Nippon Telegraph & Tel Publ Corp, NTT Lifestyle & Environm Technol Labs, Kanagawa 2430198, Japan Nippon Telegraph & Tel Publ Corp Kanagawa Japan 2430198 a 2430198, Japan Nippon Telegraph & Tel Publ Corp, NTT Basic Res Labs, Kanagawa 2430198, Japan Nippon Telegraph & Tel Publ Corp Kanagawa Japan 2430198 a 2430198, Japan Nippon Telegraph & Tel Publ Corp, NTT Photon Labs, Kanagawa 2430198, JapanNippon Telegraph & Tel Publ Corp Kanagawa Japan 2430198 a 2430198, Japan
Titolo Testata:
JOURNAL OF APPLIED PHYSICS
fascicolo: 6, volume: 88, anno: 2000,
pagine: 3408 - 3413
SICI:
0021-8979(20000915)88:6<3408:MWDOTC>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIGHT-EMITTING-DIODES; NEAR-ULTRAVIOLET ELECTROLUMINESCENCE; SILICON-BACKBONE POLYMERS; POLYSILANES; CHAINS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Hoshino, S Nippon Telegraph & Tel Publ Corp, NTT Lifestyle & Environm Technol Labs, 3-1 Morinosato Wakamiya, Kanagawa 2430198, Japan Nippon Telegraph& Tel Publ Corp 3-1 Morinosato Wakamiya Kanagawa Japan 2430198
Citazione:
S. Hoshino et al., "Molecular weight dependence of the conformational phase transition and electroluminescence of diarylpolysilane diodes", J APPL PHYS, 88(6), 2000, pp. 3408-3413

Abstract

We investigated the molecular weight dependence of the conformational phase transition behavior of thin films of poly[bis(p-n-butylphenyl)silane] (PBPS), which is a near-ultraviolet (NUV) electroluminescence (EL) material for polysilane-based polymer light-emitting diodes (LEDs). A low molecular weight PBPS with efficient NUV EL exhibited a phase transition from a disordered to an ordered backbone conformation when we increased the temperature. By contrast, the opposite transition behavior was observed for a high molecular weight PBPS. The photoluminescence (PL) quantum yield of the PBPS films changed in association with the thermal phase transition behavior; the PLquantum yield of the low molecular weight PBPS was improved by increasing the temperature, whereas that of the high molecular weight polymer deteriorated. The time dependence of the EL investigation suggests that, although the EL intensity continued to increase for the first few hours, insufficientJoule heat was generated to induce a phase transition in the entire PBPS layer of an LED made of the low molecular weight PBPS during continuous operation . We conclude that the conformational phase transition was not a key factor as regards efficient NUV EL generation, but may have occurred at themolecules in contact with the external electrodes of the LED, and may havebeen partially responsible for the improvement in the carrier injection efficiency of the external electrodes. (C) 2000 American Institute of Physics. [S0021-8979(00)01019-7].

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Documento generato il 23/01/21 alle ore 09:57:33