Investigators released surveillance video on Monday of the suspect who broke into the home on the 900 block of Arch Street.
The woman was sleeping just before 8 am when she awoke to sounds and turned on the light.
The suspect ran toward her, pointed a sharp object at her throat and demanded money, police say.
He took her purse and iPhone before leaving.
The suspect is described as a black male between 30 and 40 years old with a medium build. He was wearing a black coat, gray pants, black shoes and a gray wool hat.
Anyone with information is asked to contact Philadelphia police.
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