کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1264285 972119 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mixing of molecular exciton and excimer phosphorescence to tune color and efficiency of organic LEDs
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Mixing of molecular exciton and excimer phosphorescence to tune color and efficiency of organic LEDs
چکیده انگلیسی

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^C2^N-[1,3-di(4-methoxy-pyrid-2-yl)-4,6-difluorobenzene] chloride (PtL26Cl), a member of the Pt(N^C^N) complex series, where N^C^N represents a cyclometallating tridentate ligand based on 1,3-dipyridylbenzene, L. PtL26Cl-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/m2, achieving extremely high external quantum efficiency (EQE) up to 20% at low-current densities (<10−2 mA/cm2) and up to 17% at B = 500 cd/m2. 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Organic Electronics - Volume 11, Issue 3, March 2010, Pages 388–396
نویسندگان
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