The Multiple Roles of Metal Ion Dopants in Spectrally Stable, Efficient Quasi‐2D Perovskite Sky‐Blue Light‐Emitting Devices

2021 ◽  
pp. 2100860
Author(s):  
Cham Heng Angus Li ◽  
Pai Geng ◽  
Sunil Benachigere Shivarudraiah ◽  
Michael Ng ◽  
Xian‐Fu Zhang ◽  
...  
Keyword(s):  
Blue Light ◽  
Metal Ion ◽  
Multiple Roles ◽  
Light Emitting ◽  
Light Emitting Devices

scholarly journals Perception of Sleep Disturbances due to Bedtime Use of Blue Light-Emitting Devices and Its Impact on Habits and Sleep Quality among Young Medical Students

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Asmaa Jniene ◽  
Leila Errguig ◽  
Abdelkader Jalil El Hangouche ◽  
Hanan Rkain ◽  
Souad Aboudrar ◽  
...  
Keyword(s):  
Medical Students ◽  
Sleep Quality ◽  
Blue Light ◽  
Sleep Disturbances ◽  
Poor Sleep ◽  
Poor Sleep Quality ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
The Mean ◽  
Perception Of Sleep

Introduction. The use of blue light-emitting devices (smartphones, tablets, and laptops) at bedtime has negative effects on sleep due to light stimulation and/or problematic excessive use. We aimed to evaluate, among young medical students, if the perception of sleep disturbances due to bedtime use of these devices is consistent with healthier habits and a better sleep quality. Materials and methods. 294 medical students in medicine and pharmacy from the Faculty of Medicine and Pharmacy of Rabat, Morocco, took part in this anonymous and voluntary cross-sectional study and answered an electronic questionnaire. Student and Mann–Whitney U tests were used to compare variables between 2 groups based on their perception of sleep disturbances. The level of significance was p≤0.05. Results. 286 students (97.3%) used a blue light-emitting smart device at bedtime before sleep, and sleep quality was poor (Pittsburgh Sleep Quality Index, PSQI > 5) in 101 students (35.3%). The perception of sleep disturbances due to this night usage was reported by 188 of them (65.7%). In this group, 154 (81.9%) used their device with all the lights turned off in the room (p=0.02), 34 (18.1%) put devices under pillows (p=0.04), 114 (60.6%) interrupted sleep to check messages (p<0.001), and the mean duration use of these technologies at bedtime was 2 h ± 23 min per night (p=0.02). Also, the mean sleep duration was 6.3 hours ± 1.25 (p=0.04), 119 (63.3%) presented fatigue on waking more than one time per week (p=0.04), and 76 (40.4%) presented poor sleep quality (75.2% of the students with PSQI > 5) (p=0.005). Conclusions. Despite the perception of sleep disturbances due to bedtime use of blue light-emitting devices, unhealthy sleep habits tend to be frequent in young medical students and worrying because it is associated to significant poor sleep quality.

Active-Nitrogen-Doped P-Type ZnSe Grown by Gas-Source Molecular Beam Epitaxy for Blue-Light-Emitting Devices

1993 ◽  
Vol 32 (Part 2, No. 12A) ◽  
pp. L1725-L1727 ◽  
Author(s):  
Masayuki Imaizumi ◽  
Yasuyuki Endoh ◽  
Ken-ichi Ohtsuka ◽  
Toshiro Isu ◽  
Masahiro Nunoshita
Keyword(s):  
Molecular Beam Epitaxy ◽  
Blue Light ◽  
Molecular Beam ◽  
Active Nitrogen ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Nitrogen Doped ◽  
Gas Source ◽  
P Type

Highly efficient deep blue light emitting devices based on triphenylsilane modified phenanthro[9, 10-d ]imidazole

2013 ◽  
Vol 8 (1) ◽  
pp. L6-L10 ◽  
Author(s):  
Zhao Gao ◽  
Gang Cheng ◽  
Fangzhong Shen ◽  
Shitong Zhang ◽  
Yunan Zhang ◽  
...  
Keyword(s):  
Blue Light ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Highly Efficient ◽  
Deep Blue
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