期刊
ORGANIC ELECTRONICS
卷 11, 期 3, 页码 388-396出版社
ELSEVIER
DOI: 10.1016/j.orgel.2009.11.017
关键词
Organic light-emitting diodes; Organic electroluminescence; Exciton phosphorescence; Excimer phosphorescence; White light-emitting diodes; Platinum; Luminescence
资金
- CNR [PM.P04.010]
- FIRB
- University of Durham
- E.U. [COST-D35]
We report highly efficient, variable-color light-emitting diodes (LEDs) realized via mixing of molecular exciton and excimer phosphorescent emissions from a new organic phosphor platinum N boolean AND C-2 boolean AND N-[1,3-di(4-methoxy-pyrid-2-yl)-4,6-difluorobenzene] chloride ((PtLCl)-Cl-26), a member of the Pt(N boolean AND C boolean AND N) complex series, where N boolean AND C boolean AND N represents a cyclometallating tridentate ligand based on 1,3-dipyridylbenzene, L. (PtLCl)-Cl-26-doped TCTA blends [TCTA = 4,4',4 ''-tris(N-carbazolyl-triphenylamine)] have been used as either the low-concentration bluish-green (molecular) phosphorescence emitter or high-concentration red (excimer) phosphorescence emitter. By adjusting the relative amount of blue and red emissive species, the color of the light emission was tuned from bluish-green through green and white up to red. The concentration-optimized devices can easily reach high brightness up to B = 10,000 cd/m(2), achieving extremely high external quantum efficiency (EQE) up to 20% at low-current densities (<10(-2) mA/cm(2)) and up to 17% at B = 500 cd/m(2). High purity white light emission [CIE coordinates (x = 0.34, y = 0.35)] was realized at this B, QE = 11.5%, power efficiency of 6.8 lm/W and color rendering index (CRI) = 74, though CRI = 81 has been achieved with CIE coordinates (x = 0.42, y = 0.38). The reported performance data are among the best achievements reported for color and white emission organic LEDs. (C) 2009 Elsevier B.V. All rights reserved.
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