High temperature electro-optical degradation of InGaN/GaN HBLEDs

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. In proximate phosphor distributions, the phosphor is located in close proximity to the semiconductor chip, while in the remote phosphor configuration, there is a distance between the phosphor layer and the chip.…”

“…Application of both thermal stress and light intensity in a HAST set-up is expected to make the kinetics of degradation much faster. There are many papers regarding the reliability of LED systems [13][14][15][16][17][18][19][20][21] under thermal stress; however, there is limited information available about the effects of combined blue light intensity and thermal stress on the ageing and the reliability of remote phosphors. In this study, the effects of both stress factors, applied in the HAST set-up, are studied.…”

Real‐time reliability test for a CPV module based on a power degradation model

“…This behavior is not typical d of degradation processes, but it has been observed in other optoelectronic devices [18]. The physical explanation of this behavior can be found in both the mechanical degradation, causing the optics' misalignment, and the silicone's leak.…”

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

“…In such a system, the phosphor layer can be either deposited directly on the chip or incorporated into a lens disk. [9][10][11][12][13] Moreover, white LEDs are multipart systems. Apparently, each of these components can break and induce failure, leading to a reduction of light intensity and even early failure before the expected lifetime of the instrument.…”

“…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.…”