Improvement in the moisture stability of CaS:Eu phosphor applied in light-emitting diodes by titania surface coating

Gang, So-Ra; Kim, Deokgi; Kim, Sang-Mook; Hwang, Nam; Lee, Kwang-Cheol

doi:10.1016/j.microrel.2012.06.142

Cited by 5 publications

(1 citation statement)

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“…The heat dissipation is the biggest issue, and as a consequence, the quality of the component is of fundamental importance. However, even the phosphors should guarantee similar performance across a long period, and in this sense, chemical and photostability are the main issues (i.e., several stability problems have been reported for sulfide-based phosphors (such as CaS:Eu and SrS:Eu) due to the low stability in air [38,39]). Ce:YAG shows a high thermal stability that is also preserved under high photon fluence.…”

Section: Session 2: Properties Of the Phosphormentioning

confidence: 99%

Assessment of Crystalline Materials for Solid State Lighting Applications: Beyond the Rare Earth Elements

Ricci

2020

Crystals

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In everyday life, we are continually exposed to different lighting systems, from the home interior to car lights and from public lighting to displays. The basic emission principles on which they are based range from the old incandescent lamps to the well-established compact fluorescent lamps (CFL) and to the more modern Light Emitting Diode (LEDs) that are dominating the actual market and also promise greater development in the coming years. In the LED technology, the key point is the electroluminescence material, but the fundamental role of proper phosphors is sometimes underestimated even when it is essential for an ideal color rendering. In this review, we analyze the main solid-state techniques for lighting applications, paying attention to the fundamental properties of phosphors to be successfully applied. Currently, the most widely used materials are based on rare-earth elements (REEs) whereas Ce:YAG represents the benchmark for white LEDs. However, there are several drawbacks to the REEs’ supply chain and several concerns from an environmental point of view. We analyze these critical issues and review alternative materials that can overcome their use. New compounds with reduced or totally REE free, quantum dots, metal–organic framework, and organic phosphors will be examined with reference to the current state-of-the-art.

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Section: Session 2: Properties Of the Phosphormentioning

confidence: 99%