Direct measurement of the singlet generation yield in polymer light-emitting diodes

被引：65

作者：

Rothe, C. ^{[1
]}

King, S. M. ^{[1
]}

Monkman, A. P. ^{[1
]}

机构：

[1] Univ Durham, Dept Phys, Durham DH1 3LE, England

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.97.076602

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this study, the singlet and triplet exciton generation yields of a representative blue-emitting conjugated polymer are directly compared using simultaneous optical and electrical excitation measurements. After carefully accounting for bimolecular triplet annihilation and knowing the independently measured solid state inter-system-crossing yield of the polymer, a singlet generation yield of 44% is obtained, in the working device, which is clearly in excess of the simple quantum statistical 25% limit.

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页数：4

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共 20 条

[1] Excitonic singlet-triplet ratio in a semiconducting organic thin film [J].

Baldo, MA ;

O'Brien, DF ;

Thompson, ME ;

Forrest, SR .

PHYSICAL REVIEW B, 1999, 60 (20) :14422-14428

[2] Electron and hole transport in poly(p-phenylene vinylene) devices [J].

Blom, PWM ;

deJong, MJM ;

Vleggaar, JJM .

APPLIED PHYSICS LETTERS, 1996, 68 (23) :3308-3310

[3] Improved quantum efficiency for electroluminescence in semiconducting polymers [J].

Cao, Y ;

Parker, ID ;

Yu, G ;

Zhang, C ;

Heeger, AJ .

NATURE, 1999, 397 (6718) :414-417

[4] Triplet formation and decay in conjugated polymer devices [J].

Dhoot, AS ;

Ginger, DS ;

Beljonne, D ;

Shuai, Z ;

Greenham, NC .

CHEMICAL PHYSICS LETTERS, 2002, 360 (3-4) :195-201

[5] Triplet-triplet annihilation in a poly(fluorene)-derivative [J].

Hertel, D ;

Bässler, H ;

Guentner, R ;

Scherf, U .

JOURNAL OF CHEMICAL PHYSICS, 2001, 115 (21) :10007-10013

[6] Electroluminescence emission pattern of organic light-emitting diodes: Implications for device efficiency calculations [J].

Kim, JS ;

Ho, PKH ;

Greenham, NC ;

Friend, RH .

JOURNAL OF APPLIED PHYSICS, 2000, 88 (02) :1073-1081

[7] Femtosecond ground state recovery: Measuring the intersystem crossing yield of polyspirobifluorene [J].

King, SM ;

Rothe, C ;

Dai, D ;

Monkman, AP .

JOURNAL OF CHEMICAL PHYSICS, 2006, 124 (23)

[8] Yield of singlet excitons in organic light-emitting devices: A double modulation photoluminescence-detected magnetic resonance study [J].

Lee, MK ;

Segal, M ;

Soos, ZG ;

Shinar, J ;

Baldo, MA .

PHYSICAL REVIEW LETTERS, 2005, 94 (13)

[9] TRIPLET YIELD DETERMINATION AND HEAVY-ATOM EFFECT FROM GROUND-STATE REPOPULATION KINETICS [J].

LESSING, HE ;

JENA, AV ;

REICHERT, M .

CHEMICAL PHYSICS LETTERS, 1976, 42 (02) :218-222

[10] Triplet-to-singlet exciton formation in poly(p-phenylene-vinylene) light-emitting diodes -: art. no. 036601 [J].

Lin, LC ;

Meng, HF ;

Shy, JT ;

Horng, SF ;

Yu, LS ;

Chen, CH ;

Liaw, HH ;

Huang, CC ;

Peng, KY ;

Chen, SA .

PHYSICAL REVIEW LETTERS, 2003, 90 (03) :4