Red-Enhanced White-Light-Emitting Diode Using a New Red Phosphor

Reliability and Lifetime Prediction of Remote Phosphor Plates in Solid-State Lighting Applications Using Accelerated Degradation Testing

“…[1][2][3][4][5][6][7][8][9][10] In this type of LED, the phosphor is either coated on the chip or mixed with the lens disc. [11][12][13][14][15][16][17][18][19][20][21][22] The spatial distribution of phosphor in white LED lamps strongly influences the colour uniformity and the efficiency of the light source.…”

“…Recent development strategies are based on the production of white LEDs in the lower CCT range (2700-4500 K), since lumens per watt values of LEDs in this range exceed those in the incandescent lamps. 7,8 The main aim of reliability studies in the LED industry is to analyze the system reliability data for SSL luminaires and components and to determine the time-to-failure of the components. Recent publications 9,10 provide recommendations for assessment of the lifetime of luminaire products.…”

Synthesis and Luminescence Properties of Sr/SmSi5N8:Eu2+Phosphor for White Light-Emitting-Diode

“…In order to obtain a warm and good color rendering white light output, LED emission should be adjusted by two methods. One is to compensate the red deficiency of YAG: Ce 3+ -based LED with a separate red light 5) and the other is to combine UV chip with red, green, and blueemitting (RGB) phosphors 6) . In recent years, SiN 4 -base covalent nitride materials, including nitridosilicates, nitridoaluminosilicates and other nitrides etc., have been extensively studied as a good host lattices for White LED because nitride materials have strong absorption of the light emitted by the LED chips, i.e., UV (350 -410 nm) or blue (440 -480 nm) light.…”

Effects of Graphene Monolayer Coating on the Optical Performance of Remote Phosphors

“…Currently, there are different technologies used to produce white light high-power LED systems. [4][5][6][7][8] The most common one is combining a blue chip with yellow phosphor. In such a system, the phosphor layer can be either deposited directly on the chip or incorporated into a lens disk.…”

“…Numerous investigations have been performed on various parts of LED-based products; however, not much has been done on the lens/remote phosphors of the LEDs. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Recent reliability studies [14][15][16][17][18][19] have shown that the optical degradation of white LED products is mainly due to the aging of the encapsulants/lens. The encapsulants/lens are mainly used to prevent thermal shock and mechanical stress as well as humidity-induced corrosion.…”