Abstract

Spontaneous luminescent decay combined with total internal reflection (TIR), harnessed in devices known as luminescence (or fluorescence) concentrators (LCs), can generate light with intensity 10-1000 times greater than pump lamps or pump LEDs can provide directly [1]. LED pumped luminescent concentrators (LC) provide a low-cost, high-brightness, and energy efficient stable light output. Where LED light sources alone lack in intensity and brightness, LCs offer the potential for high-efficiency light, enhanced brightness and generation of new wavelength components whilst benefiting from the long lifetime and ruggedness of LEDs [2]. LCs provide a wide range of excitation and illumination applications, from medical applications to laser pumping [3]. However, a key challenge in using LC is the extraction of generated light due to the trapping of emitted light owing to the TIR.

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