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FP5

OPAMD Informe resumido

Project ID: G5RD-CT-2001-00577
Financiado con arreglo a: FP5-GROWTH
País: Ireland

Demonstration of (doped) polymer and nanocrystal based LED structures for emission in the visible and near-infrared

Tyndall has developed (doped) polymer and nanocrystal based LED structures for emission in the visible and near-infrared. Electroluminescence spectra of Eu-doped LED devices exhibited a well-resolved emission peak centred at 612nm, assigned to the 5D0 -> 7F2 transition of the Eu3+ ion. Best results obtained for the Eu-doped devices gave an EQE of 0.03% and a maximum brightness of 130 cd/m2 at 380 mA/cm2 and 25 V. A series of Nd-doped LED devices were also fabricated and tested. EL spectra exhibited characteristic emission centred at ca. 1065 nm, assigned to the 4F3/2 ®4I9/2 transition of the Nd3+ trivalent ion, with a FWHM of ca. 35nm. A maximum EQE of 0.007% and a maximum luminance of 8.5 nW at - 480 mA/cm2 and 42 V was measured for these devices. Tyndall has also developed and tested a series of LED devices based on HgTe quantum dots. Near-infrared EL was successfully detected from ITO/PEDOT/HgTe/Al devices, with an intensity maximum at - 1660 nm and a FWHM > 250nm. A maximum EQE of 0.02 % and a maximum light output of 150nW/mm2 at 50mA and 2.5V was measured for these devices.

Reported by

Tyndall National Institute
Lee Maltings
CORK
Ireland
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