Abstract
Efficient and stable red phosphors are greatly important with respect to their applications in solid state lighting and display panels. The incorporation of red phosphors makes value addition to the current lighting technology and displays in terms of high color rendering index (CRI), low correlated color temperature (CCT) and full color gamut. The current chapter focuses to bring out the developments in the lighting technology and the importance of red phosphors for various applications more particularly in the area of lighting and displays. The commonly used red activator ions such as Eu3+, Eu2+, Sm3+, Pr3+, Mn4+ and Cr3+ are also described in the chapter about their luminescence characteristics and their suitability for red phosphor applications in lighting and displays. To achieve an efficient red luminescence, a suitable host lattice should be able to accommodate the red activator ions with less phonon vibrations, good thermal and chemical stability. The influence of the common host lattices like orthosilicates, nitrides and oxynitrides, sulfides and other oxides is illustrated for the electronic transitions of various activator ions to provide the red luminescence. A large number of red phosphors in different host lattices have been developed and the notable ones are CaAlSiN3:Eu2+, Y2O2S:Eu3+ and (Sr, Ba)3SiO5:Eu2+ that have shown commercial potentiality for display and lighting applications. Still there are many challenges in developing red phosphors for their lacuna in weak absorptions, large stokes shift, broad and narrow emissions, cumbersome and energy intensive synthesis routes, thermal and chemical stability and quantum efficiency. In this context, the discovery of novel red phosphors with excellent luminescence properties under efficient excitations in the near UV and blue light is expected for warm light illumination and display panels with full color gamut.
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Raj, A.K.V., Rao, P.P. (2023). Red Emitting Phosphors for Display and Lighting Applications. In: Kumar, V., Sharma, V., Swart, H.C. (eds) Advanced Materials for Solid State Lighting. Progress in Optical Science and Photonics, vol 25. Springer, Singapore. https://doi.org/10.1007/978-981-99-4145-2_8
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