Enhancing Thermal Stability of Laser-Driven Phosphor Converter by Utilizing Copper Powder Sintering Framework/Paraffin

Ding, Xinrui; Chen, Mingqi; Yan, Caiman; Guo, Huaxing; Shao, Changkun; Yu, Binhai

doi:10.1109/ted.2021.3136803

Cited by 10 publications

(4 citation statements)

References 35 publications

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“…As a relatively simple method to realize white laser lighting, a blue LD is used to excite the yellow-emitting phosphor converter that is essential to the performance of white LD (w-LD). For meeting application requirements of white laser lighting, many phosphor-converted materials have been researched from organic type to inorganic type [11][12][13][14]. Owing to low heat resistance and poor thermal conductivity of organic matrix materials (less than 1 W/(m•K)), there is intense thermal quenching induced by nonradiative loss from phosphor conversion in the resin-based organic phosphor materials under high-power laser excitation, resulting in the carbonization and thermal failure of phosphor converter.…”

Section: Introductionmentioning

confidence: 99%

Laser spot associated high-saturation phosphor-in-glass film for transmissive and reflective high-brightness laser lighting

Yu¹,

Zhao²,

Wang³

et al. 2023

Journal of Advanced Ceramics

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Phosphor-in-glass (PiG) film is a promising luminescent material in high-brightness laser lighting for its advantages of high efficiency, outstanding color quality, and low-cost preparation, which must bear high laser power (LP) and laser power density (LPD) simultaneously to enable high-luminance light. Herein, laser spot associated high-saturation PiG film was proposed for transmissive and reflective high-brightness laser lighting. Two types of PiG films were prepared by printing and sintering La 3 Si 6 N 11 :Ce 3+ (LSN) phosphor-borosilicate glass pastes on a sapphire substrate (PiG-S) and an AlN substrate (PiG-A), respectively. The PiG films with perfect crystal structure of phosphor were reliably bonded on the substrates. The effects of laser spot areas on the luminescence saturation of LP and LPD were investigated in the PiG films. With the increase of laser spot area from 0.5 to 2.5 mm 2 , the LP threshold of PiG films is gradually raised, while the LPD threshold of PiG films is decreased. The PiG-S withstands a high LP of 23.46 W and a high LPD of 20.64 W/mm 2 , enabling white light with a luminous flux of 3677 lm. The PiG-A withstands a high LP of 41.12 W and a high LPD of 35.56 W/mm 2 , enabling white light with a luminous flux of 2882 lm. Moreover, the PiG-A maintains lower working temperature compared with the PiG-S, and the temperatures reduce with the increasing laser spot area. The results demonstrate that the laser spot associated PiG films realize high saturation thresholds of LP and LPD simultaneously, and enable high luminance for laser lighting.

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Section: Introductionmentioning

confidence: 99%

Laser spot associated high-saturation phosphor-in-glass film for transmissive and reflective high-brightness laser lighting

Yu¹,

Zhao²,

Wang³

et al. 2023

Journal of Advanced Ceramics

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“…Assessing and comprehending the impact of the aforementioned processing factors on the structural thermostability of coatings is an essential prerequisite to expand the application fields and maintain the antirelaxation performance. Regrettably, the extensive efforts to the thermal behavior of paraffin/OTS coatings revolve around the postfabrication environmental factors. − Currently, it is unclear how processing factors affect the thermal changes in the end products for these organic films. The lack of clarity presents challenges for optimizing the processing and predicting the reliability of these films.…”

Section: Introductionmentioning

confidence: 99%

Effect of Preparation Processes on Structural Thermal Stability and Collision Energy Dissipation of Common Antirelaxation Coatings on Quartz Substrates

He,

Liu,

Tang

et al. 2023

Langmuir

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Paraffin and octadecyltrichlorosilane (OTS) coatings can alleviate collisions between alkali-metal atoms and cell walls and then prolong the atomic spin-polarization lifetime. The surface structure and collision effects of these antirelaxation coatings, as well as the methods to avoid antirelaxation invalidity, have been the focus of researchers. This study investigated the thermolability of coating surface structure and the collision interactions between alkali metal atoms and coatings, considering the influence of various coating preparation factors, where this collision interaction is indirectly analyzed by measuring the collision energy dissipation between an atomic force microscopy (AFM) probe and the atoms on the coating surface. We found that appropriate evaporation time, carbochain length, and postannealing process can enhance the thermostability of the paraffin coating and eliminate its morphological defects. Furthermore, the OTS/water concentration, the soaking time, and the type of solvent have different levels of influence on the cluster formation and the thermostability of the OTS coatings. Moreover, the antirelaxation performance of coatings has been shown to be characterized by counting the energy dissipated when the AFM probe collides with the antirelaxation coating, replacing the conventional light-atom interaction-based method for measuring the relaxation characteristics, but requiring specific coating preparation factors to be maintained.

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Section: Introductionmentioning

confidence: 99%

“…Due to the poor heat resistance and low thermal conductivity of organic resin, the problem of resin carbonization and thermal quenching of the phosphor occurs at high temperatures, which makes the organic fluorescent layer meet the packaging requirements of white light laser diodes. [21][22][23][24] In order to solve this problem, researchers have proposed to use inorganic fluorescent conversion materials with high thermal stability instead of organic fluorescent resin materials for white laser diode packaging, including luminescent single crystals, fluorescent ceramics, and phosphor-in-glass (PiG). [25][26][27] PiG is an inorganic composite material composed of glass and phosphors.…”

Section: Introductionmentioning

confidence: 99%

All-inorganic color converter based on a phosphor in bismuthate glass for white laser diode lighting

Li,

Xu,

Yang

et al. 2023

Dalton Trans.

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Enhancing Thermal Stability of Laser-Driven Phosphor Converter by Utilizing Copper Powder Sintering Framework/Paraffin

Cited by 10 publications

References 35 publications

Laser spot associated high-saturation phosphor-in-glass film for transmissive and reflective high-brightness laser lighting

Laser spot associated high-saturation phosphor-in-glass film for transmissive and reflective high-brightness laser lighting

Effect of Preparation Processes on Structural Thermal Stability and Collision Energy Dissipation of Common Antirelaxation Coatings on Quartz Substrates

All-inorganic color converter based on a phosphor in bismuthate glass for white laser diode lighting

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