Tricolor Phosphors Research Articles

Ultraviolet Pumped Tricolor Phosphor Blend White Emitting LEDs

Near-UV and violet emitting AlGaInN single quantum well LED structures were grown by MOCVD on sapphire substrates. On-wafer tests before processing gave an output power at 40 mA between 1.4 mW at 380 nm and 6.7 mW at 420 nm. LED chips with wavelengths between 380 and 404 nm were selected for manufacturing radial UV LEDs and white emitting LEDs. The UV to white converters were prepared from broad band red, green and blue emitting powder phosphors with individual luminescence peaks near 610, 550 and 460 nm, respectively. White luminescence conversion (LUCO) LEDs with a warm hue and color temperatures in the range 4000-4300 K are demonstrated.

Ultraviolet Pumped Tricolor Phosphor Blend White Emitting LEDs

Near-UV and violet emitting AlGaInN single quantum well LED structures were grown by MOCVD on sapphire substrates. On-wafer tests before processing gave an output power at 40 mA between 1.4 mW at 380 nm and 6.7 mW at 420 nm. LED chips with wavelengths between 380 and 404 nm were selected for manufacturing radial UV LEDs and white emitting LEDs. The UV to white converters were prepared from broad band red, green and blue emitting powder phosphors with individual luminescence peaks near 610, 550 and 460 nm, respectively. White luminescence conversion (LUCO) LEDs with a warm hue and color temperatures in the range 4000-4300 K are demonstrated.

Identification and optimization of advanced phosphors using combinatorial libraries

A combination of thin-film deposition and physical masking steps were used to generate libraries of the rare earth activated refractory metal oxides, Gd(La,Sr)AlOx. Systematic variation of composition and processing conditions afforded tricolor phosphors with the following nominal compositions, (Gd0.46Sr0.31)Al1.23OxF1.38:Eu0.062+ (green), La0.5Al1.5Ox:Eu0.042+ (blue), and Gd0.77Al1.23Ox:Eu0.063+ (red), which had quantum efficiencies of ⩾94%, ≃60%, and ⩾93%, respectively at λmaxex. The high quenching temperatures (250–350 °C), good chromaticities and refractory nature of these phosphors are desirable features for display applications.

A Ce 3+ sensitized, Tb 3+, Mn 2+ codoped polyaluminate phosphor

The idea of using one sensitizer with two “cooperative” activator has been carrierd out in a Ce 3+ sensitized, Tb 3+, Mn 2+ codoped polyaluminate. The phosphor emits strong green light and may be used as a competitive component of tricolor phosphor for fluorescent lamp.

ChemInform Abstract: NEW TRICOLOR PHOSPHORS FOR GAS DISCHARGE DISPLAY

AbstractDie Eigenschaften einer Reihe von Phosphoren unter UV‐Anregung werden im Hinblick auf die Entwicklung von Dreifarbenphosphoren für die Anwendung in Gasentladungsdisplays zur Farbfernsehbildwiedergabe untersucht.

New Tricolor Phosphors for Gas Discharge Display

The properties of phosphors under vacuum ultraviolet excitation are investigated in order to develop tricolor phosphors for use in gas discharge panel to reproduce color TV pictures. The excitation spectra in the wavelength range of 100–300 nm and the radiant efficiency of the phosphors incorporated with experimental gas discharge cells are measured. Based on these results, (red), (green), and (blue) are selected as the new tricolor phosphors which bring high white luminance and wide color gamut to the color picture display panel.