II–VI semiconductor color converters for efficient green, yellow, and red light emitting diodes

摘要

II–VI compound semiconductor quantum-well heterostructures were fabricated for use as efficient,nnarrow-spectrum, photoluminescent color converters to generate green, yellow, or red light whennphotopumped with blue GaInN light emitting diodes u0002LEDsu0003. This approach promises highnefficiencies in a wide range of wavelengths that includes the green-yellow portion of the spectrumnwhere conventional LEDs offer relatively low efficiency. External quantum conversion efficienciesnof 60%–70% and output spectra with full width at half maximum of 15 nm were achieved usingnCdZnSe–CdMgZnSe quantum wells grown by molecular beam epitaxy on InP substrates.