A structure includes a semiconductor light emitting device including a light emitting layer disposed between an n-type region and a p-type region. The light emitting layer emits first light of a first peak wavelength. A wavelength-converting material that absorbs the first light and emits second light of a second peak wavelength is disposed in the path of the first light. A filter material that transmits a portion of the first light and absorbs or reflects a portion of the first light is disposed over the wavelength-converting material.

 
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> External cavity organic laser

> On-p-GaAs substrate Zn1-xMgxSySe1-y pin photodiode and on-p-GaAs substrate Zn1-xMgxSySe1-y avalanche photodiode

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