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Patterned structure of REMOTE PHOSPHOR for phosphor-converted white LEDs

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Abstract

High efficiency white light-emitting diodes with superior color-mixing have been investigated. It is suggested that the patterned remote phosphor structure could improve the uniformity of angular-dependent correlated color temperature (CCT) and achieve high chromatic stability in wider operating current range, as compared to the conventional remote phosphor coating structure. In this experiment, we employed a pulse spray coating method to place the patterned phosphor on the package and to leave a window region. The window area, a clear space without coating of the phosphor not only increases the extraction efficiency of blue rays at large angle, but also improves the stability of angular-dependent CCT. Moreover, the CCT deviation could be reduced from 1320 K to 266 K by this patterned remote phosphor method, and the stray blue/yellow light within the package can be effectively reduced and controlled. The design was verified both experimentally and theoretically.

©2011 Optical Society of America

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Figures (6)

Fig. 1
Fig. 1 X-ray perspectives of two phosphor distribution models: (a) conventional remote phosphor structure, showing phosphor on top of the encapsulant surface (b) patterned remote phosphor structure, leaving a window region without spraying phosphor.
Fig. 2
Fig. 2 The angular-dependent correlated color temperature of two phosphor distribution structures.
Fig. 3
Fig. 3 The current-dependent luminous efficacy and luminous flux of the pc-WLEDs with conventional remote phosphor and patterned remote phosphor structures.
Fig. 4
Fig. 4 The color chromaticity deviations of the LED with conventional remote phosphor and patterned remote phosphor structures with different LED injection current.
Fig. 5
Fig. 5 The ray tracing simulation results: (a) The left is conventional remote phosphor structure (with thin phosphor coating on package entire surface) and (b) the right is patterned remote phosphor structure (with thicker phosphor coating only in the center region).
Fig. 6
Fig. 6 The angular-dependent intensity ratio of yellow to blue rays. The conventional remote phosphor structure has serious ratio deviation. However, the patterned remote phosphor structure keeps high consistency even at the divergent angle close to 70 degrees.
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